Be sure to try the other method of installing stock firmware if yours have unlocked Bootloader issue. This update is meant for Acer Iconia Tab A200 or A210 users only.

You can also backup your Acer Iconia Tab A200 or A210 offline – without internet connection following the steps provided here.Setup an auto or carry out a manual backup regularly of your Acer Iconia Tab A200 or A210 following our guide here with data or Wi-Fi connection.Just before you follow the tips below to upgrade or downgrade your Acer Iconia Tab A200 or A210. Stock firmware flashing can be applied to revert back to the stock of your Acer Iconia Tab A200 or A210 to gain your warranty.Stock firmware flashing is effective in solving software issues of Acer Iconia Tab A200 or A210.To fix stutter or lag on your Acer Iconia Tab A200 or A210.It can be applied to unroot or fix bugs on your Acer Iconia Tab A200 or A210.Stock Firmware flashing can be applied to either upgrade or downgrade your Acer Iconia Tab A200 or A210.Stock ROM flashing can be applied to fix Bootloop issues.Stock Firmware flashing can be applied to Unbrick your Acer Iconia Tab A200 or A210.Next you will have to follow the instruction of using a Smart Phone Flash Tool as explained here.As usual you need to place your phone on charge till it is charged not less than 50 percent before you process else you phone might not wake up even after formatting.Download the stock ROM of Acer Iconia Tab A200 or A210.Your device should now be rooted without having to unlock the bootloader or anything else.Steps on how to flash Acer Iconia Tab A200 or A210 with SP Flash Tool: Put it on the root of your sdcard like so Rename the file to update.zip (do not modify or extract in any way before using) no need for the hard to find tool any longer) (not sure if this has to be done from honeycomb only, but it should work with the ics / jellybean firmwares as well. Here is the attempt for the acer iconia a200 tablet I have since been working on porting this method to other devices. I did this for the zte merit / avail smartphone I developed the first and only update.zip method of rooting (many have tried to copy my work and distribute as their own)

Acer iconia a200 firmware update