Update failed, stuck in TWRP mode and not enough space to download zip file

[Alex.A]

@LKala

the phone is telling me that it was unable to find partition for path ‘/system’ and that the zip verification failed.

I believe your problem is the same (or very similar) as this one:

Fairphone OS 19.11.2 update. Upgrade error: Unable to find partition for path '/system'

Hello. I have a Fairphone 2 and yesterday I tried updating from Fairphone OS 19.08.1 to Fairphone OS 19.11.2. I ended up on the Team Win Recovery Project with an “unable to find partition for path system” error. Unfortunately I didn’t think of googling this error first, so in succession I tried the following: Manually updating from my PC (Windows). This didn’t work as, prior to this, I’ve been having lots of issues with getting my PC to recognize my fairphone using a USB cable. I download…

Please have a look and try what I and others have suggested over there. You might have to manually reinstall FPOS ( in this case please do a twrpbackup before, you will lose all your data!).

@LKala

do I need to swipe to turn on sideload on the phone then run the zip file on my computer?

Yes. You first swipe to sideload on TWRP and then run the adb sideload [zip file] command from the computer.

@LKala

Also when you said ‘when in TWRP try adb devices’, I didnt’ have a devices option, it only offers adb sideload.

Sorry, I have not been explicit enough: I meant enter adb devices in the terminal or cmd on your computer, and see if it outputs a device connected (just when being in TWRP).