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I have a ZTE Z958 running 5.1....ZTE has official update to 6.1 on the site in an update.zip (1.2gb). I tried the recommended method of storage card update and FAIL. I tried forced update via Android recovery (power button/vol) and FAIL. I even tried applying update via ADB and FAIL. I'm not a total newb but geeze..any guidance appreciated.
Error messages range from cannot mount sdcard to ...NOT a KS package...
Pics attached. Help and thanks