I couldn't find an answer to this after searching, and I really wasn't sure which is better, so I'm just going to ask.
Eclipse or CM7? Pretty straight forwards... please say why also! Thanks in advance.
You can not go wrong with either one. Both are great and are solid daily drivers. If you need HDMI then eclipse is for you. Cm7 is blazing fast and has so many options for themes and the theme Chooser. But eclipse also has great themer's as well. I would recommended having nano back up of each and go back and forth and see what fits you best. But you will really enjoy both.
Thanks for the reply. Yes, I agree, both of them are known to be solid ROM's - each with their advantages and disadvantages...
HMDI I've never even used, and don't plan on it. Many things people have a "problem" with are things that I don't use, such as HDMI, GPS (seldomly use), etc.
Right now I'm flashing Eclipse 2.1.
What I did is run one for a few weeks and get it running how I like. Then nano back up and then try another for a few weeks. Get it like you want and do another back up. At one time point I had several roms backed up. Now I stick with eclipse and cm7. If you have never used cm7 it is something you should run at some point. It is blazing fast and you can customize everything. It will take you weeks to figure out all the settings.
even though I run CM7 now, I would say eclipse is an overall "better" rom in terms of supporting all the phone's features and being stable, like rock solid stable (was more stable than stock motoblur, and a bazillion times faster)
I would definitely call CM7 a beta, it has bugs, you learn to live with them.
My favorite overall so far was eclipse 1.3rc2
Eclipse FTW
I've been on both ROMs recently and I would have to say that they are both superior to any thing else out there. I'm on the latest ROM for eclipse and all I can say is that this is fast... very fast on the DX2. You can't go wrong with either ROM, it comes down to HDMI support and then your preference.
CM7 definitely fastest but went back to eclipse for hdmi, stability and nuance voice control. Still have some problems with eclipse but allot less than cm7. One drawback of eclipse is 2.3.5 kernel, so when nandroiding have to sbf to switch roms.
Sent from my DROID X2 using XDA
I use eclipse 2.1 on my X2. I had previously use CM7 for a month before switching. Yes CM7 is much faster, but Eclipse is more stable and has less bugs.
It's all about personal preference.
Sent from my Amazon Kindle Fire using XDA
Travisdroidx2 said:
What I did is run one for a few weeks and get it running how I like. Then nano back up and then try another for a few weeks. Get it like you want and do another back up. At one time point I had several roms backed up. Now I stick with eclipse and cm7. If you have never used cm7 it is something you should run at some point. It is blazing fast and you can customize everything. It will take you weeks to figure out all the settings.
Click to expand...
Click to collapse
+100!! I think this is the best option. Try them both out, and back them up. I am running CM7 and love it. Yes, it's lightning fast, but that isn't even my favorite feature. I prefer its customization overall. It has bugs, as a beta will, but I haven't experienced any that are deal breakers for me.
Sent from my MB870 using xda premium
Thanks for all the feedback everyone. Great deal of help to me (and I'm sure others).
Right now I'm running Eclipse 2.1 (I previously had Eclipse 2.0.2). From what I've seen so far I can notice a speed improvement overall, some updates and GREAT stability; much better than even the stock.
Later on I'll try out CM7, but I'm just worried about all the bugs it has... I'm sure it's nothing, but I'd rather have slightly less performance and stability. Either way, I'm still going to try it out sometime soon. Thanks again for all your feedback.
Also, I'm not into nandroid backups at all.. or any backups. I'd rather do a clean slate EVERY SINGE TIME. I don't have a ton of apps, so I can get it all back, along with my settings very easily. Just and FYI for you all.
EDIT: Also, just to clarify things - along with give people other information; I will be writing a FULL review of each ROM. Note that many of this will contain personal opinions and such, but it will greatly help people overall with info about them.
tshelby73 said:
CM7 definitely fastest but went back to eclipse for hdmi, stability and nuance voice control. Still have some problems with eclipse but allot less than cm7. One drawback of eclipse is 2.3.5 kernel, so when nandroiding have to sbf to switch roms.
Sent from my DROID X2 using XDA
Click to expand...
Click to collapse
I felt the same way about sbf and re root not a huge deal but yes extra time. I heard people had luck with 2.04 on 2.3.4. I had to try and all was working well. Have not tried that with 2.1 but do a nano back up first just in case and remember it is not recommended but it has worked for quite a few people just not sure for 2.1.
Miui works on 235/412 and I nanded to cm but did not stay long but wifi worked.
Related
Hello all,
I was just wondering what your impressions were re, the most stable ROM out now, the one with the least issues. Is there one that seems to be most hassle-free? I'm not nessasarily looking for a lot of bells and whistles...
Thanks!
Used to enjoy Theory's ROMs but felt that every few weeks he'd discontinue a ROM and release a new one. If you want a sense ROM that has a good following, I'm gonna be taking a look at SynergyROM, or if you want a non-sense ROM (AKA AOSP) I'd go CM7 (CynergyMod 7).
I'm aosp fan personally. I've used Cyanogenmod extensively, as well as Omgb. I'm currently running TheROM V4 and it is rock solid stable and very responsive. Not many bells and whistles. Just vanilla gingerbread.
It depends on what you want aosp or sense
For me I'm an aosp girl I'm running cyanogenmod 7 v1.7 loving it and. Ill give the kernel I'm using for battery life
If I don't want aosp anymore I always go to. http://teambamf.net/
I love das bamf! or if not go to http://themikmik.com/forumdisplay.php?1004-HTC-Thunderbolt-Developer-Forum I personal really like chingy's roms
I don't like Droid theory just saying
If you like sense, I really like Chingy's Gingeritis 3D.
Second vote for Gingeritis 3D. Stable and great battery life if you just use better governors.
Definitely the wrong forum, bro.
been rocking cleantheory to shiftsense for the past two weeks. both have been rock solid. DT is stopping development though, so take it for whatever that means. i think at some point all ROMS eventually lose development. hopefully whatever you choose is good enough for your daily driver if you dont like flashing over and over.
ShiftS3ns3 by DroidTho3ry rocks - give it a shot.
I think I'm going to give Gingeritis 3D a try. I'm not a pro at flashing new ROMs... i've only done it once (running BAMF 1.3 now). Is there anything special I should do? Is it just like flashing the BAMF ROM? (can I do it from ROM Manager?)
Thanks!
sushiman79 said:
been rocking cleantheory to shiftsense for the past two weeks. both have been rock solid. DT is stopping development though, so take it for whatever that means. i think at some point all ROMS eventually lose development. hopefully whatever you choose is good enough for your daily driver if you dont like flashing over and over.
Click to expand...
Click to collapse
DT mentioned that he's taking a break, so hopefully he won't be gone too long. His work is better than stock.. HTC ought to hire him and get out of his way.
If you want Sense ROM, can't go wrong with SkyRaider Preview 2 or ShiftS3NS3.
If you want AOSP based ROM, SHIFTAO5P hasn't given me any problems whatsoever.
If you can live without the 3d, skyraider preview 2 is rock solid.
courtesy of my bolt and tapatalk
FWIW, I have been pretty pleased with the Synergy ROMs and I'd be running one now but...... I was one who fell victim to either the ROM Manager update or the CWM update and now cannot restore any of my backups. I tried various earlier CWMs w/o success and finally un-rooted, installed stock, did the OTA update and I'm back 100% stock.
I mention this because it's relevent to the question..... Battery life is good, the stability is excellent and, once customized to my liking, I really can't see much difference other than the "billions and billions" of crap apps VZW and HTC have added to the phone. If I could get rid of them I'd be just fine with the stock ROM believe it or not!
I'll probably re-root at some point and it's VERY likely I'll go back to the Synergy ROM because it works. I've had rebooting problems with other ROMs I've tried and I'm no longer in a mood to experiment, maybe later?
OK, it's later. I rooted, using Revolutionary, used Titanium backup to remove VZWs crapware and then figured why not? and installed the latest Synergy ROM.
I guess I just can't live with a non-rooted phone for 24 hours..... <sigh>
i keep trying out different roms all the time(sense & aosp based) and find that i'll keep going back to Synergy. it seems the most stable just i having issues with settling with just one rom.
Everyone has a different opinion on what stable is. I think CM7 is plenty stable, but there are those that disagree for whatever logical/illogical reason. Mainly, if you aren't prepared to encounter issues either brought up by your own experimenting or those of the ROM developer, I would stay with what the phone came with and be happy you have a phone that (sort of) works
If you are more brave, then read on.
If you read the comments about most ROMs, there is no such thing as a 100% infallible, will never ever let you down, stable ROM. ROMs are generally bleeding edge and users accept the fact they may have bugs in exchange for the phone doing more than what HTC and verizon allowed them to do. However, ignore most comments, because those are generally just people that screwed something up either knowingly or unknowingly. Like people that go the the hospital (for those that have family members that work at one), not everyone is ready to admit they did something stupid and have it on public display
yareally said:
If you read the comments about most ROMs, there is no such thing as a 100% infallible, will never ever let you down, stable ROM.
Click to expand...
Click to collapse
Skyraider with Ziggy's kernel is EXACTLY this. It has average to good battery life though. Everything works, including it being compatible with call recording and incredicontrol (voltage control app). It also has the notification tweaks that no one has quite duplicated and I have grown to love.
I find Synergy to be an excellent rom as well, but the themes available do not suit me at all. It does support everything with good battery life and also adds HTC Hub which is awesome. It also has DConfig, which I just have not gotten a great benefit from but I guess some might.
The theory sense rom was smooth as silk, and seemed to be a happy medium between the first two I posted.
Chingy's rom is VERY slick, but very vanilla. The fact that it is Odexed makes theming harder I think, but for me that means I cannot replace the HTC browser with the AOSP one, and I HATE THE SENSE BROWSER lol.
ALL AOSP roms seem to have squashed most of the crappy battery issues and get great battery life now. This added to a FAR FAR FAR better bluetooth stack for better use with wireless devices like Jawbone, AND compatability with PS3 hardware make them an awesome choice. The ONLY problem is the lack of reliable network location. This means google maps works perfect, but your web browser can and will put you across the world sometimes, as well as weather apps etc. This rules it out for me for now.
Hope that helps
Shifts3ns3 has been the best for me, while I liked synergy, it had more bugs and seemed much slower to me, shift has the useful 3.0 features without the slowdown of a full sense 3.0 rom
Sent from my ADR6400L using XDA App
I need help finding a simple working ROM. My wife has this phone, and she has seen me put ROM's and all that on my phone and wants me to put one on hers. Problem is, I need to find one that works (isn't an alpha, works with almost all applications). Any help would be appreciated!
Try SuperClean 3. Basically a tweaked version of Samsung's TW Gingerbread.
Link? Im having trouble finding it
Sent from my DROID X2 using XDA App
http://lmgtfy.com/?q=superclean+v.5+download+for+fascinate
2nd for SC3. I run it with imoseyons lean kernel and have NO issues. Great battery life, fast (2100 to 2300 on quadrant scores), and STABLE!
3Rd for SC. All though cm7 is stable fast and pretty simple to navigate.
Sent from my SCH-I500 using Tapatalk
Plus you can flash the TW4 addon for Superclean 3 v0.5
Terminators run on Android...
IMO CM7 and MIUI suck for the fascinate, Go with Superclean of GeeWiz ROMs for Fascinate. I'm stable, quick, no glitches, lags, chokes, all apps work flawlessly. after flashes dozens of roms over a period of months.. I am content with my setup.
See sig for links. Good luck.
I would cast another vote for SC3. I was on CM7 since nightly 15 or so thru 112. Loved it, but in my low-signal area the data drop problem was significant. I was toggling airplane mode numerous times a day.
I tried SC3 to get more stable and have been impressed. There's things I miss from CM7 but SC3 is a lot more stable in my case. I'm also running comradesven's kgb kernel.
Another observation is that the EH03 radio works better on SC3 than it did on CM7. I tried it and went back to ED05 which worked best for me on CM7. With SC3/EH03, my data speeds have improved somewhat over CM7/ED05.
YMMV, good luck.
edit: got to change my signature I guess.
If you want a stock like experience without all of Verizon's crap (like you'd get on the Showcase) then I'd go with GeeWiz; it also has great kernels with it. If you want one with a more current and customizable feel, then Superclean3 is hard to beat.
Just my 2ยข worth.
Sent from my SCH-I500 using XDA App
I use JT's vanilla gingerbread
http://rootzwiki.com/topic/1993-rom-vanilla-gingerbread-v81-1108-fascinatemesmerizeshowcase/
It's fast, no bloat, really stable, and it has lots of goodies. can't wait for my phone to get shipped back from repair so I can use it again!!
agreed, go with SC ROM unless you want ICS. Then, for now CM9/JT's builds are the only game in town right now.
Just installed SC. Wow, love love love it! It even somehow fixed the camera lag I was having. Was taking like 1.5-2 seconds to take a photo after press after Verizons last update. Back to near instant again.
I backed up the phone with Titanium, then restored once SC was on. Worked awesome.
I really just want to use my phone as a WIFI device and have it as fast as I can. Seems like most roms I load still make it quite slow.
Also one where the camera works without bugs would be nice.
Anyways, I think there is a script that lets you disable the radio and mobile, but what ROM would be best if I just want something clean, stable, and quick. nothing fancy.
Vanilla I've heard about, but not sure of the correct one to go with.
Thanks
bryank29 said:
I really just want to use my phone as a WIFI device and have it as fast as I can. Seems like most roms I load still make it quite slow.
Also one where the camera works without bugs would be nice.
Anyways, I think there is a script that lets you disable the radio and mobile, but what ROM would be best if I just want something clean, stable, and quick. nothing fancy.
Vanilla I've heard about, but not sure of the correct one to go with.
Thanks
Click to expand...
Click to collapse
As fast as it can run, with a stable camera? Honestly, I think that you are best off with one of the xtr close-to-stock ROMs (xtrSENSE, xtrROM if you don't want the Sense launcher.) I'm not sure if the WiFi only script works on these - I've never tried them - so you'll have to try yourself.
(One of the best parts about being rooted is that it's easy to try things out and then just Nandroid restore back to something that worked if you try something that messes up.)
I use GSB and really wouldn't consider any other ROM on the Eris as an option. GSB is definitely the best out there, and with the "Wifi only" script the battery life is pretty amazing too.
Currently using GSB v4.4, running efficiently. So it may be an option to choose, however, there are other rom's that run great too. For example, Gin-Tazz-aosp; I found to run great, another one to consider. Subsequently, just try rom's that lurk and see which one runs remuneratively(in your perspective)
I have just rooted my Eris, and I'm debating which way to go regarding a new ROM. I want to keep all of the major device functions, and I'm really just wanting to speed up the operation of the phone. Adding some visual excitement wouldn't be bad either. Does GSB 4.4 provide this?
BTW, the phone is currently running 2.1 OTA.
Thanks!
Designman said:
I have just rooted my Eris, and I'm debating which way to go regarding a new ROM. I want to keep all of the major device functions, and I'm really just wanting to speed up the operation of the phone. Adding some visual excitement wouldn't be bad either. Does GSB 4.4 provide this?
BTW, the phone is currently running 2.1 OTA.
Thanks!
Click to expand...
Click to collapse
Well, you can consider xtrSense; since it derives from most of all the Sense. Also, GSB is a CM7 nightly and is particularly focused on CM7 only. Furthermore, it does not contain any Sense functions. Now don't get me wrong GSB Is phenomenal. Though, if your considering something mostly with Sense, xtrSense is advised; also it being overclocked, Collin_Ph script(saves battery), etcetera. Hope this helped
Sent from my ERIS using xda premium
Designman,
Definitely go with GSB 4.4. I've used this series of Roms since oct '10 and it's been great. I just upgraded to the Razr but I still use my Eris to play around on. I actually just flashed 4.4 from 4.3. the other night and it's really good. You'll like it and obviously it's got full functionality, the only major bug that I know might still exist is with Maps 5.5. or later isn't compatible. But there's an easy fix for that.
Right now I've been happy running the Droid X2's stock Motorola Android 2.3.4 (rooted). That has met my needs (and wants) but only in a "meh" kind of way. After seeing some of the screenshots and user reviews about some alternative Android builds out there, I decided it's time to give one a try. Awhile ago, there were only one or two different ROMs for the X2 so the choices were limited, but simple. Now, I'm seeing some awesome things like CM7 running on the X2.
I'd really like to dual boot, if possible. That way, if the other ROM is crashing too much, or killing the battery, I can switch back when I need to. Is this possible with, say, CM7? I've also heard some good things about Eclipse. Namely stability. Stability isn't the highest priority for me, as long as it works most of the time.
So, what do you think is the best alternative ROM out there for the X2 for someone who is willing to try something unstable but still usable? If it can dual boot (if that's even possible on the X2) with my currently installed stock ROM, that'd be a big plus.
EDIT: I've also been looking into MIUI, but I'm not sure if the nice design is enough to sway me.
There isn't really anything you can do as far as dual booting goes with the x2. What you could do, is create a backup using BSR and then flash between those backups. You'd still need to have a wall charger to change between the two, but it works. it's what I've been doing with MIUI because I still want HDMI mirroring.
Cm7 is very stable and it's what i use. There are only a few things that aren't functioning, but they are minor and won't cause any frustration for most. If you were satisfied with stock blur then you will love cm7. My first choice for blur based roms is eclipse. Very stable, very reliable and an overall great experience.
Dual booting would essentially be nandroiding like skel said. I've run into issues doing this with cm7 though, md5 got messed up but it works for most and has worked for me before.
Enjoy flashing your new roms, it becomes an addiction quickly.
Sent from my Transformer Prime TF201 using xda premium
That's probably what I'll do. Make a backup and start the adventure. Haha.
Just installed CM7. What a beast.
Its incredible isn't it. Like one of the worlds wonders but in electronic form.
Sent from my MB870 using xda premium
cm7 is indeed a beast. took my phone a few days a wipes to get used to it but im running strong now.
My only concern with it right now is battery performance.
Go to the market and download Battery Calibration. Once downloaded charge all the way to 100% and run the app. I was on Eclipse and now run CM7 and will never look back. It's way faster and my battery life is great.
Thanks, I'll give it a go.
I'm with you; I am ready to try something new. I hope to be running CM7 by this weekend if not sooner. We have so many good choices right now compared to a few months ago. I think I will stick with 2.3.4 based ROM's for now of which CM7 is one. It seems the Eclipse is now based on 2.3.5. Since there is no official release of this yet I plan to wait on it. Enjoy the awesome cheap upgrade for your phone; I know I will.
Leland
Getting fairly good battery on this ROM too. Pleasantly surprised.
lgwhitlock said:
I'm with you; I am ready to try something new. I hope to be running CM7 by this weekend if not sooner. We have so many good choices right now compared to a few months ago. I think I will stick with 2.3.4 based ROM's for now of which CM7 is one. It seems the Eclipse is now based on 2.3.5. Since there is no official release of this yet I plan to wait on it. Enjoy the awesome cheap upgrade for your phone; I know I will.
Leland
Click to expand...
Click to collapse
Eclipse works fine for me on 2.3.4 not much of anything really changed from 2.3.4 to 2.3.5 basically the same thing
Sent from my DROID X2 using Xparent Blue Tapatalk
Hey guys, just jumped ship from Sprint and put an X2 on PagePlus. I'm on day 2 with this phone and it's not bad... I'm coming from an EVO 3d and was running MIUI latest.. I'm seeing with all the roms posted here they all have querks. I'm wondering if there are any stable roms that have fully working MMS, camera, vid cam, FM, sleep, etc? I'll keep reading on my own but just curious what you guys might recommend?
I'd love to be on a stable ICS build if there is one floating around.
This really belongs in Q&A. As far as REALLY stable stuff, your best bet is a GB rom like eclipse or CM7. Everything works really nicely on those roms. The CM10 rom that Dragonzkiller ported over isn't bad, but it's got its issues. Just check out his thread.
CM7 is VERY stable. I never ran Eclipse. I will say that I have ran CM7, 9, and 10 and also ran ParanoidAndroid on CM9 and CM7 is by far the most stable and snappiest. Unfortunately I do believe this phone is starting to become obsolete and work is starting to cease on making CM9 and 10 fully stable.
Eclipse 1.3 is rock solid and I get almost 2 days of battery use out of it with a few tweaks.
Agreed, Eclipse is the most stable and all-around polished ROM for the X2. CM7 is nice, but I use my HDMI from time to time and it isn't supported.
I think I have tried them all and for me Eclipse is the best. or stock. even those have some issues. Eclipse does a reboot occasionally say once a day or two, and it has a quirk about wifi that sometimes it just goes away until i open the settings then it connects again.
I have tried eclipse 2.3, cm7 and cm10. I had wifi issues with both cm7 and cm10. I have never had a problem with eclipse 2.3. Fully functionable. Fm, mms, camera, camcorder. They all work. As for issues with wifi. Never had any. Haven't experienced any random reboots. There are also plenty of themes via adw or Holo. It just takes time searching for what you like. I'd highly recommend eclipse 2.3 though.
Sent from my Eclipsed Droid X2 using Tapatalk 2
I just wanted to echo the votes above for Eclipse.
Personally, I think the older versions were slightly faster and better on battery life, but you really can't go wrong with Eclipse. v 2.3 has some very nice features, and I doubt you'll have many (if any) quirks with it. All the features work fine for me, with no problems. That includes all those mentioned (fully working MMS, camera, vid cam, FM, sleep) as well as HDMI, application install and storage on SD cards, etc. It's truly a wonderfully built ROM, and a lot of time has been put into making it fast, clean, and functional.
As several mentioned above, there are some other very nice ROMs out there, based on AOSP. These definitely DO have merit, but I'm not really sure if the people posting them actually read and understood the OP's question. "Stability" might be a subjective term, and in many respects those ROMS could be considered more stable than Blur or Blur-based ROMs, But it's misleading to say that those ROMs don't have glitches. AOSP ROMs have issues with MMS, camcorder, HDMI, etc. There are imperfect fixes and workarounds for some of these issues, but certainly not all.
I don't want to discourage you from trying CM7, 9, 10, AOKP or Paranoid Android ROMS. These are each amazing in their own rights. I just installed AOKP and it is absolutely beautiful!! It's smooth, and has many of the options I've always been looking for on this phone. The flip-side is that there are SO many things that just do not work or that have "quirks". Each of these roms lists the known issues, but with AOKP, I've found that there are pretty significant problems with all of the following: MMS, Google Now, input (keyboard) glitches, voice recognition/voice dialing, HDMI, SD-card apps (and SD-storage in general--don't expect backed-up app-data to be recognized by most programs), tethering (wifi-AP), camera, video camera, many apps have "texturing" that causes crashes (e.g. chrome), etc.
But I think it's important to note that DESPITE all these significant problems, the OS is so amazing and fast and beautiful, that it is really hard to decide whether or not to switch back to Eclipse, especially since it doesn't seem to have been updated in a while (at least based on the xda post...not sure about twitter and nitro's eclipse website)
Good luck flashing (ROMs) and have fun!
I've tried them all and suggest that you do the same and find out what suits you best for me it's cm7 but I do keep nanos of them all in case I start having flash withdrawals or find a new mod to try
don't be scared it's only a phone
ogd x d2g x2 sg3
old ladies ^
ive tried most of them and cm7 is probably the most stable. Im running cm10 right now and it runs pretty good considering the circumstances. yes the x2 is becoming obsolete but its still a good phone with good hardware, unfortunately its true potential is locked in a cage.
Thanks for all the replies guys, I flashed Ecplise and played with it for a bit and not bad. I played around with SBF which is a new concept to me coming from yeaaaars of HTC devices.
I can't get CM10 to install I think I need to SBF to 2.3.4 before BSR. In recovery it says the zip is invalid.. I even tried downloading it again. I'll keep messing with it but yeah, trying every rom I can that looks promising.
Right now I'm back on stock rooted (nandroid backup) of 2.3.5
Last question, does data tether work if rooted?
Most roms have it baked in so yep
don't be scared it's only a phone
ogd x d2g x2 sg3
old ladies ^
Hurry take it back!!!
Sent from my Nexus 7 using xda premium
sledwrecker said:
Thanks for all the replies guys, I flashed Ecplise and played with it for a bit and not bad. I played around with SBF which is a new concept to me coming from yeaaaars of HTC devices.
I can't get CM10 to install I think I need to SBF to 2.3.4 before BSR. In recovery it says the zip is invalid.. I even tried downloading it again. I'll keep messing with it but yeah, trying every rom I can that looks promising.
Right now I'm back on stock rooted (nandroid backup) of 2.3.5
Last question, does data tether work if rooted?
Click to expand...
Click to collapse
You must be on 2.3.4 for cm10 to work. Eclipse is the only rom out there that requires you to be on 2.3.5.
Sent from my Eclipsed Droid X2 using Tapatalk 2
---------- Post added at 11:35 AM ---------- Previous post was at 11:33 AM ----------
Also tethering does work if you're rooted.
Sent from my Eclipsed Droid X2 using Tapatalk 2