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Solved: Updating partition details… Unable to open zip file. Error flashing zip

When trying to flash my old Motorola Xoom using this excellent guide http://www.xda-developers.com/motorola-xoom-still-alive-and-kicking-receives-functional-kitkat/ I was unable to flash the system and google apps zips from TWRP and received the following error:

Updating partition details...
Unable to open zip file.
Error flashing zip '/sdcard/update.zip

The error wasn’t quite verbose enough. I found when I tried to have another stab at flashing the recovery partition Android was more helpful and told me that the battery level was too low.

Plugging the device in I was able to flash the device straight away and bring my Xoom back to life and make use of an old tablet again!