Meizu Pro 5 - Can't upgrade firmware (current version 5.1.2.0G)

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2017-08-25 06:50

I've got a Meizu Pro 5 that I got second hand. It was already rooted, but it's not clear how. Anyway, I can't install any updates, I'm stuck on version 5.1.2.0G. Neither the OTA updates work, nor saving update files on the device and trying to install them over the recovery. It always says "Firmware corrupt". Is there some way to update the device? I've tried firmwares from this page (all three, 6.1.0.0G, 5.1.12.0G and 5.1.11.0G):
http://www.flymeos.com/firmwarelist?modelId=10&type=1
Nothing works.