[How-to] Safely update to B27 from Rooted or B20_boot (A2017U)

ok, i see there's a few users with B20_boot or Rooted who want to get B27 OTA, well here is the little guide

- Download stock Recovery from here B20 stock recovery thanks @rczrider and this one ZTE_A2017U_StockB20U_by_DrakenFX.zip
- Go to TWRP, WIPE DATA- CACHE-DALVIK .
- Now make sure SYSTEM was unchecked in mount and check mount system read-only ( THIS IS IMPORTANT DON'T SKIP THIS STEP)
- Flash this file ZTE_A2017U_StockB20U_by_DrakenFX.zip
- Flash stock recovery you downloaded and reboot and you can now safely just Update to B27 via System Update app.

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