Problems Need Serious Help on - Sony Xperia P, U, Sola, Go

I got some series of questions regarding My new Xperia S for which i would be very great full if answered..
I will directly get down with the questions..
1. Some days back my Xperia-S stopped snycronizing with my pc, Pc companion will detect my phone just as an phone but stopped accessing it's internal memory. Did some research and found no help. Even SEUS update wont update my phone n alwayz threw an error saying "My phone has modified app in it so it cant be updated"
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ADDTIONAL :
1. There is no recent WMP update for Windows 7 ( as some suggested)
2. Unistalling/Reinstalling PCC ..Enabling/Disabling USB debugg from phone and then clearing up MTApp/Force close, doesnt work.
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What i found? : Through this forum search i found that this problem occurs if you have your Bootloader Unlocked or if your phone is Rooted. Searched on with the service number ( *#*#7378423#*#*) and Bootloader Unlock says "YES"
Q: Does it mean that my Bootloader is Locked or Unlocked? If locked then how come i cant access to SEUS for general update or how come PC COMPANION wont recognize my phone?
P.S : Thanks to Napster, Rogro and DoomLord for this great app -- SD CARD MOUNTER FOR XPERIA S
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2. After i found out that i have root access to my phone (Found it out when i hooked my phone to flashtool ..yeah! m a noob!) i found out that i can manually update my phone by downloading stock roms. Hope am right on this one. Questions are..
a. My Xperia came with .73 Firmware. Do i need to update .75 before i can update it to .76 and so on? And whats the difference between Rooted/Pre-rooted/TW and NL?? Coz i dont think .76 firmwire has any generic ftf file on xda server :S
b. Can i update any ROMS on my Phone? As in ICS got Generic DE, NL and so on .. Need to know the differences too.
c. What is the difference between Custom ROMS and Stock ROMS?
d.My Rooting status still says that i have my Bootloader Locked .. it says YES (It does mean that my bootloader is locked right??) Do i need to Unlock my bootloader to update firmwires and stock roms through flashtool? Or should i just let it be?
Please do let me know..
Thank You
Regards
Ashique From Bangladesh

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So long...
Don't need to unlock your boatloader if you want to flash stock only.
For other ROMs, you should. Only for miui you don't have to.
I advise you strongly to read the all you need to know post in development...
Sent from my LT26i using xda app-developers app

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Through the picture you have been posted, I have a feeling that u've unlocked bootloader! And *#*#7378423#*#* said Allow bootloader unlock= yes: doesn't state that u've either unlocked or locked bootloader but it does tell you that u're able to unlock your bootloader! Once u've unlocked it, ur phone won't sync with ur pc, that's the reason why i've said that u've unlocked bootloader! To gain access to PCC or SUS again u must relock ur bootloader! To use flashtool u don't have to unlock ur bootloader if u want to update with official .tft., but u can't flash any custom kernels. Finally u can skip any updates if you want either on Official PCC or flashtool! Hope this would help!
Sent from my LT26i using xda premium

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monivan said:
Through the picture you have been posted, I have a feeling that u've unlocked bootloader! And *#*#7378423#*#* said Allow bootloader unlock= yes: doesn't state that u've either unlocked or locked bootloader but it does tell you that u're able to unlock your bootloader! Once u've unlocked it, ur phone won't sync with ur pc, that's the reason why i've said that u've unlocked bootloader! To gain access to PCC or SUS again u must relock ur bootloader! To use flashtool u don't have to unlock ur bootloader if u want to update with official .tft., but u can't flash any custom kernels. Finally u can skip any updates if you want either on Official PCC or flashtool! Hope this would help!
Sent from my LT26i using xda premium
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Thanks for the updates and about the bootloader well i guess its unlocked. Though i face new problem, which is, i had root access before i upgraded my firware to .76 TW. Can you tell me how i can gain back my root access with .76TW STOCK firware? Cant use titanium or busybox anymore

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If u want to gain back ur root access u need to flash custom kernel if u've unlocked bootloader! I suggest using Advance stock kernel v11 as it's more like stock kernel!
Sent from my LT26i using xda premium
Don't forget to hit thank button, if i'm being helpful!
---------- Post added at 08:31 PM ---------- Previous post was at 08:30 PM ----------
Wait are u on stock GB? I think u need to upgrade to ICS or use other custon kernel for GB!
Sent from my LT26i using xda premium
Don't forget to hit thank button, if i'm being helpful!

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monivan said:
If u want to gain back ur root access u need to flash custom kernel if u've unlocked bootloader! I suggest using Advance stock kernel v11 as it's more like stock kernel!
Sent from my LT26i using xda premium
Don't forget to hit thank button, if i'm being helpful!
---------- Post added at 08:31 PM ---------- Previous post was at 08:30 PM ----------
Wait are u on stock GB? I think u need to upgrade to ICS or use other custon kernel for GB!
Sent from my LT26i using xda premium
Don't forget to hit thank button, if i'm being helpful!
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I had this phone from thailand. The bootloader was already unlocked and had a firware .73 of GB. I also had my root access back then. But today i downloaded the .76TW firmwire from Xda File server n flashboot it to my Xperia. The phone is running perfectly fine though i lost my root access but the bootloader is still unlocked. And yeah its still running GB 2.3.7 just with .76 firware with no root access anymore. Do i need to flash it again with KA Xperia prerooted TW .76 firmware? I dont wana use the ICS as one of my friend updated his Xperia S with ICS n now he cries every now and then .. Anywayz, Heres the screenshot with .76 firmware running GB 2.3.7

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READ THE POST IN DEVELOPERS FORUM!!!
Sent from my LT26i using xda app-developers app

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elvirag said:
READ THE POST IN DEVELOPERS FORUM!!!
Sent from my LT26i using xda app-developers app
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Read it already otherwise how do u think i managed to get this far :S ??? I couldn find any answers regarding to get your root access back with .76tw stock firmware. Just need to know if i need to reflash it with KA_preroot_.76TW firmware or something else =/

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ashqmallik said:
Read it already otherwise how do u think i managed to get this far :S ??? I couldn find any answers regarding to get your root access back with .76tw stock firmware. Just need to know if i need to reflash it with KA_preroot_.76TW firmware or something else =/
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Well, when I read it, I got past the stage you are at. Follow it one by one, use the same stuff and then when you get how it works really, you can ask questions.
You can even pm me if ya want.
Sent from my LT26i using xda app-developers app

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ashqmallik said:
Read it already otherwise how do u think i managed to get this far :S ??? I couldn find any answers regarding to get your root access back with .76tw stock firmware. Just need to know if i need to reflash it with KA_preroot_.76TW firmware or something else =/
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Click to collapse
If you just want to root your stock .76 TW firmware, here is what i would do:
- download the advanced stock kernel (GB) by DooMLord
- connect the phone to pc via fastboot mode (i.e turn off and then connect the phone to pc via usb with vol. up key pressed)
- flash the advanced stock kernel using fastboot command
- switch on the phone an wait for some time
- then extract kernel.sin from the .76 ftf and flash it using flashtool or fastboot command.
If you follow these steps, then you should have a stock .76TW firmware with full root acess! good luck :good:!

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Dpk1 said:
If you just want to root your stock .76 TW firmware, here is what i would do:
- download the advanced stock kernel (GB) by DooMLord
- connect the phone to pc via fastboot mode (i.e turn off and then connect the phone to pc via usb with vol. up key pressed)
- flash the advanced stock kernel using fastboot command
- switch on the phone an wait for some time
- then extract kernel.sin from the .76 ftf and flash it using flashtool or fastboot command.
If you follow these steps, then you should have a stock .76TW firmware with full root acess! good luck :good:!
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AWESOME! I did exactly what u said =D .. and now my Xperia S is totally rooted running on the stock Kernel .. THANK YOU VERY MUCH ~