How could I return to stock 4.1.1?

[yackoo]

Please help!
I have unlocket the bootloader and rooted my A2109, and installed CWM and rom from here: http://www.androidtablets.net/forum...ly-bean-rooted-deodexed-crapware-removed.html.
I have installed this kernel too: http://www.androidtablets.net/forum/lenovo-ideatab-a2109-development/55577-custom-kernel-4-1-jb.html
I have made nandroid backup, but my usb stick was corrupted, so I don't have backup now...

I must return to stock 4.1.1 ROM and lock bootloader - I should send my A2109 to Lenovo's service (problem with touchscreen). Could you help me and tell, how to return to stock 4.1.1 (EU version)?
I have find this files http://www.androidtablets.net/forum...l/52307-useful-files-drivers-modded-roms.html - how should I use them? Should I flash via ADB "Stock 4.1.1 worldwide" and it's all?

Thanks for any help!

 

[mcl630]

Do a factory reset and flash the Stock 4.1.1 worldwide ROM. If you need to relock the bootloader, after booting the stock ROM once, you can do 'fastboot oem lock'.