I have been trying to upgrade z10 to 10.3.1 on Tmobile US from 10.2 for past few days. Every time it errors out with "Communication Error 2" close to 90%. I have deleted enough apps and data, I have close to 6gb free space and over 1.2 gb free memory.
The whole process runs for close to 5 hours and then it errors out. In the end the OS is still 10.2
Can some help and tell me what is going wrong and how to fix it?
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