WARNING!!: This is for Version 2.10.1
not for older version!
Same Flashing Methods in my old thread
Link: Tutorial - Modified ZTE Firmware For ZLT-S10G (Enabled Telnet, DropBear, ADB, pre-installed APNs, CloudFlare DNS Installed)
Requirements...
FREE ZLT-S10G 2.10.1 to 2.11.3 Full PC/Mobile Permanent Openline (Unlock)/Change IMEI/Telnet/SSH Tutorial
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Full credits to R1BNC and Backspace Team