help on ROM reverse
I'm newbie in rom flashing, after I upgraded from O2mini Eng HK version rom to Dopod 818 CHT by 'press power to update' and want to reverse it back to O2mini Eng HK rom from backup (ntrw2.0) now, the bootloader prompts me that 'not allow to upgrade' even I tried to replace any of 220bytes header.
Is there anything I missed. Are there any gentlements would kindly tell me what's the tricks or workable HK O2 Eng rom can be downloaded?
Thank you so much for any helps.