I have successfully rooted my ACER A1-830 as explained on this thread.
Android Version: 4.2.2
Image Version: Acer_AV052_A1-830_RV07RC05_WW_GEN1
Compilation Nº: Acer_AV052_A1-830-1.014.00_WW_GEN1
Now I'm facing some problem with the Micro-USB port and I need to send it back to warranty an I didn't make any backup of the original rom.
Does anyone knows where can I download the original rom and how to flash it back?
Can anyone can help me on this?