The package with the 1st Custom ROM/Firmware for Mega Drive Flashback is ready !
It contains 3 folders:
1 - the 1st one provide a way to fully backup your console NAND to have a working recovery solution if something goes wrong.
2 - the 2nd one is a pre-cooked firmware with RetroArch integrated; it can be flashed as-is if your console NAND configuration is the same as the one provided
(read the included .txt for more information)
3 - the 3rd one is a folder where you can play with ADB and the console; you can find some batch scripts and some shell script to see how the console works.
The console is based on Android 4.4.4; my unit has 4GB NAND but I saw some other units with 2GB only so be careful when flashing (read the included .txt files) !
The console is probably compatible with external USB flash drives but I need to test it (I miss the correct USB mini to USB female adapter).
It took me almost 2 weeks to achieve that result and it is nothing more than some "script-kiddie" stuff, feel free to modify and use it as you prefere.
The readme files are best readable with
Metapad (wrap test option ON).
I will probably not have the time to answer questions but I wrote quite exaustive readmes inside the package to explain each step better. if you have doubts write them here but do not get angry if I will not answer
Download link.