Originally Posted by ken_alpha24
Redownload FW, reflash FW, then recovery mode, wipe cache and data, you get a booting!
Sent from my GT-I8160 using xda app-developers app
Thank you for your fast response
I had already done it, but i repeated all the process (including redownloading the firmware) with same result, GB doesn't boot, phone remains stuck at Ace2 logo and only "download mode" is available so I couldn't perform wipes
Nevertheless I tried to go back to JB (MG2) and... SURPRISE, phone boots and recovery mode is available again, I was able to load SU patch, temporary CWM and even CM10 and MIUI5, BUT... touch screen doesn't respond at all, including menu and back buttons, so I couldn't bypass menu selection window in any firmware
Trying to downgrade to GB again produces same results, lack of recovery and phone stuck. I think phone is condemned to use JB but I have no clue about how to solve touch screen problem (I haven't found similar sympthoms across the threads).