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1. FLASH ONE T-MOBILE FIRMWARE FROM THE SUPPORT
2. SELECT 'WRITE PARTITION' AND FROM THE LIST THAT APPEARS SELECT 'PROTECT1' -> DOUBLE CLICK IT AND SELECT
MEMORY_DUMP_ZTE OBSIDIAN_d9231f349bbe9ff463d9028396ccf095_TMOBILE_CONVERT.osp
3. SELECT 'SIM_LOCK REMOVE' AND PRESS 'DO JOB'
4. ENJOY A FULLY CONVERTED Z820 WITH IMEI