I have ME301T
Sounds crazy but I did as instructed in Michal's OP and it worked.
Unzipped the zipfile downloaded from Asus.com (can't post link due to noob status. Search on asus for memo pad smart 10 then select drivers and tools, then OS and then firmware)
renamed the zip that is extracted from that zip, as described in OP.
put it on my fat32 SD and it worked.
My tablet randomly started bootlooping, I didn't add any new apps or make other changes before, it just started looping randomly.
I may have let the battery drain completely though. Had to unplug the battery (youtube describes this) before trying reloadin order to get it to start charging again. Then did the procedure in this thread and I'm all good now.