[SOLVED] [Q] Stable CM7.1 Fails - AT&T Samsung Galaxy S II SGH-I777

Hey guys. I've been an Android & XDA user for a while now, so this question shouldn't be about a nooby-sitiuation.
My friend bought an AT&T Samsung Galaxy SII (SGH-i777) this week. I've been trying to flash CM7 ever since. I got the rooting done, the properly recovery (with no signature / "abort" problems)
The rom seems to keep bricking the phone. Its simply unflashable. I seen tons of people on XDA who got it to work, with barely any serious problems. I troubleshooted the problem myself, and its simply just the CM7 roms. I would do a full wipe, and then install the rom like I would on my other Android phones, and the installation is successful. When it boots, it gets stuck on the Galaxy SII boot screen (not the splash/boot animation screen) and it would stay on it with a yellow warning triangle on the bottom.
I tried flashing other roms, like Cognition X2, and they worked. Its just CM7 on this phone... which is odd because CM7 is usually stable (nightlies aside.) Especially since the 7.1 stable version was recently released. Anyone can help me get the rom up and going? Would be highly appreciated.

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did you try to wipe dalvick cashe as well when you wiped data?

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I just flashed it tonight myself and all I did was reboot into CWM and did a Wipe data/factory reset and then Wipe cache partition. After doing that, I simply flashed the cm7 zip file that was loaded on my internal sd. Rebooted and no problems.

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I didn't have ANH ISSUES installing it but I know I read that some.people bad to flash it twice initially. So flash it, then when it goes back to the recovery screen flash it a second time. I also remember users on the international SGS2 bad to do the same thing. Most have no issues but I think they found that it depends on what you used to root your phone (on the SGS2 internationals) and I THINK some had to do the same here. Try it and if it works just hit the thanks button.
Sent from My KickAss CM7 Galaxy S2

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if you flash it and get stuck in a bootloop, just pull the battery, and 3-finger back into recovery to flash the rom again.
keep doing this until you get it up and running - took me a few times, including a couple of battery pulls.

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How do you boot into recovery? I know On the SGH-i777 you have to hold the Vol down+back+power to get to the Download mode, but I tried everything to get to the recovery itself.

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Boobie Watcher said:
did you try to wipe dalvick cashe as well when you wiped data?
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Yes. I've flashed many roms before, this seems to be the only one I had ever seen a problem with.

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mfpearson said:
if you flash it and get stuck in a bootloop, just pull the battery, and 3-finger back into recovery to flash the rom again.
keep doing this until you get it up and running - took me a few times, including a couple of battery pulls.
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Click to collapse
Word.
Edit: To boot into recovery vol up+vol down+power

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Had the same problem. Read somewhere to install the ROM twice in a row in CWM without rebooting inbetween. Worked like a charm.

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Thanks for the feedback guys. I'll try this in the morning once I get my hands on the phone again.

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Saw this type of behaviour on occasion with cm7 on my aria. Sometimes caused by a bad download of the rom. Did you verify md5s ?
Sent from my SAMSUNG-SGH-I777 using Tapatalk

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Don't forget to do a master data clear /reset before trying to boot the new CM7 rom for the first time - clear out the old stuff. Works perfectly here.
Sent from my SGH-I777 using xda premium

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I'm having the same issue. I'm getting signature errors when trying to flashCM7.1 stable. I've downloaded it two times now with the same problem. My question is, I'm trying to flash from on the phone itself, storing the zip in the download dir on the phone as I don't have an sd card. Will this even work? I've tried looking around and all I can find is flashing from an sd card. I can get one, I just haven't yet.

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squigge said:
I'm having the same issue. I'm getting signature errors when trying to flashCM7.1 stable. I've downloaded it two times now with the same problem. My question is, I'm trying to flash from on the phone itself, storing the zip in the download dir on the phone as I don't have an sd card. Will this even work? I've tried looking around and all I can find is flashing from an sd card. I can get one, I just haven't yet.
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That's the way I did it. Put the update in the same folder on the internal SD card. I can't even access my external SD card from CWM.
Sent from my SGH-I777 using xda premium

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Hmm, I'm not sure what I'm doing wrong then. I did a factory reset, and wiped the cache and get the same thing. I know it wiped because now I have nothing setup on the phone when I boot normally. Suggestions?

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Quit downloading the CM7 builds for the International Galaxy S II. They will NOT work. That is why it fails. Look for the Galaxys2ATT build.
Sent from my SGH-I777 using xda premium

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I got the build by going to the cm7 website, looking by device, finding the galaxy s 2 and grabbing the stable one. So perhaps that is the incorrect one and I'll look closer for one that has att in it, whenever the site isn't going up and down. They seem to be having issues today.

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Make sure you're installing the version located in this thread...
http://forum.xda-developers.com/showthread.php?t=1297568
Specifically this link

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Double flash made it work. Thanks guys. + thanks for telling me how to boot into recovery lol. Great rom.

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Sorry for the newb issues, it was the wrong version. I got the att version from the thread previously mentioned and that worked perfectly. Thanks!