CLOSED.

[caocaolatre199x]

DELETED.

 

[zgfg]

I use the P9 L09 hardware version in Japan. I just installed rr 6.0 onto my P9 and now i want to go back to stock ROM. I had backup my stock rom with twrp (boot, data, system, vendor). But after I restore, my P9 hangs the logo. I waited 30 minutes. I just remembered updating the OTA to L09C635Bxxx NRD90M_test-keys but could not remember the number after B. tried L09V635B397 dload and fail. tried flash via fastboot boot, recovey, system extract from update.app but still stop at boot logo after I reboot to system. So what do I need to do to get back to the default software version? someone please help me. thanks so much. sorry for my bad English.

Every week or so a new user opens a new (but old) topic here, how he/she bricked the phone by trying to roll back fron RR to stock.
It's really boring to repeat the same each time again

I'm really puzzled with couple of questions
1. Why RR users don't post/ask in the RR thread
2. Why nobody searches on XDA (particularly in in this QA section) to learn how to do it properly, before bricking his phone
3. Why developer(s) of RR did not bother to advice users how to go back to stock. If he didn't bother to do it, why nobody else fron the P9 RR comunity did not bother either. After all, it looks like an intentional trap, how to screw up as many users and phones

This is the method to reinstall stock from custom ROMs like RR
https://forum.xda-developers.com/showpost.php?p=75787156&postcount=3

You should have applied it while you were on RR, but maybe it can still help you

 

[caocaolatre199x]

Every week or so a new user opens a new (but old) topic here, how he/she bricked the phone by trying to roll back fron RR to stock.
It's really boring to repeat the same each time again

I'm really puzzled with couple of questions
1. Why RR users don't post/ask in the RR thread
2. Why nobody searches on XDA (particularly in in this QA section) to learn how to do it properly, before bricking his phone
3. Why developer(s) of RR did not bother to advice users how to go back to stock. If he didn't bother to do it, why nobody else fron the P9 RR comunity did not bother either. After all, it looks like an intentional trap, how to screw up as many users and phones

This is the method to reinstall stock from custom ROMs like RR
https://forum.xda-developers.com/showpost.php?p=75787156&postcount=3

You should have applied it while you were on RR, but maybe it can still help you

Really sorry if that made you feel so upset. I tried everything including HWOTA and not all. I am really impatient to set up this topic. After waiting for someone to respond to this topic, I went back to success by rolling back to android 6 and getting OTA back to 7.0. Anyway thank you for the answer.
closed topic. Admin please help me delete this thread. thanks again.