Here are unofficial builds of e-1.11-r
for this device
- LTE Version SGP621
z3tc
- WiFi Version SGP611
z3tcw
I have run the WiFi version and it seems to work as expected. I dirty flashed it over my unofficial Lineage for microG build (see https://forum.xda-developers.com/t/rom-z3tc-lineageos-18-1-sgp621-unofficial.4256523/post-88466081), and all my installed apps continued to work under /e/OS
I haven’t run the LTE version at all - you’re on your own
I described how I managed to install my Lineage for microG build on my z3tc wifi in this xda forum post. I’m pretty sure that steps 3 & 6 aren’t needed: installing with TWRP didn’t work. If you follow steps 7 - 9, you can install any ROM using PBRP.
To boot to recovery press the power key, and once it has vibrated, keep tapping the volume down key until the blue led lights up
I’d be interested to hear how these builds perform, but I can’t offer much support. I suggest subscribing to this XDA forum thread
Good luck