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So, managed to upgrade via SFTP, NO DRIVERS installed.
What I did, others might find helpful.
I was on the UMIDIGI Z2 Pro V1.0_20180914 ROM (local OTA installed)
Chose the UMIDIGI Z2 Pro V1.0_20180920 ROM for SFTP
Started SP Flash tool, in Firmware upgrade mode, did the necessary steps, clicked Download. THEN, whit the phone powered down, held the POWER BUTTON and VOLUME UP BUTTON till the SP Flash tool started transfering (in my case 1-2 seconds)
Once it was finished, booted up just fine, and voila, got notification about new OTA (vers 926), did the upgrade via OTA, rebooted, boom, got a new OTA update to 20180823_20181024_1600.
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