I found a Galaxy A5 (2016) with /e/OS-Q v1.5 and TWRP Recovery 3.6.2_9 and was still able to do an OTA update to /e/OS e-1.17-q-20231110351091-dev-a5xelte, although the download is no longer made available here
Next, I installed TWRP 3.7.0_9-0, but the system did not boot into TWRP Recovery, but stopped at the Samsung logo. I was also unable to start /e/OS-Q v.1.5. Strange, isn’t it?
Well, I thought to myself and flashed the e-Recovery e-1.19-r-20240110, which is available in @ronnz98’s e-1.19-r-20240110-UNOFFICIAL-a5xelte.zip. This still worked fine, but the installation via adb sideload failed with this message:
Error: 21
Install completed with status 2.
Installation aborted.
So, now 3rd attempt, and - this one was completely successful.
First I installed TWRP 3.6.2_9 again and booted into it;
wipe cache + Dalvik + System format Data adb push e-1.19-r-20240110-UNOFFICIAL-a5xelte.zip /sdcard INSTALL with TWRP Wipe Cache/Dalvik > Swipe to wipe Reboot system
Hip, hip, hooray! Everything is better than it was yesterday.
As you device is abandonned by Samsung, you don’t need (you can’t) upgrade the firmware.
simply install “e-1.19-r” over “e-1.17-q”
As you already have a custom recovery installed on your device (recovery-e or TWRP), you can go direct to step (8) or (9) but try without wiping or formating anything
I use this phone as a Daily driver on my Linux Mint machine.
I can watch TIKTOK and other Android Apps on my PC, it works perfect.
Pls tell me if you want to do the same, I can help you =).
Oh yeah, just a little reminder for everyone that wants to install e/os/ on A3 or A5 models - the newest version of twrp doesn’t work (3.7.0_9), use older one (I used 3.6.2.).
@Xxpsilon already mentioned it earlier on this topic, I can confirm that is universal problem.
Huge thanks for those unofficial builds, you made two of my phones useful again! (a3 a3xelte, s6 zerolte)
Faster than stock firmware, a3 is used as a music player.
As stated above official twrp 3.7 does not work i had to use 3.6.2, device integrity can be bypassed with PIF & sensitive props magisk modules, magisk works correctly (27006) and can be hidden from apps, snapchat refuses to let you login on a3xelte,zerolte this problem is unrelated to your builds and is present even on s8 with custom roms i assume its a kernel limitation.
Older versions can be installed and aded to deny list, then you can log in and update the app.
a3xelte update: version 2.2 has way worse wifi and bt range, bt audio stutters but 1.19 worked better…
i tried 2.2 with kernel from 1.19 and it works better
I found a Galaxy A5 (2016) with /e/OS-Q v1.5 and TWRP Recovery 3.6.2_9 and was still able to do an OTA update to /e/OS e-1.17-q-20231110351091-dev-a5xelte, although the download is no longer made available 
Next, I installed TWRP 3.7.0_9-0, but the system did not boot into TWRP Recovery, but stopped at the Samsung logo. I was also unable to start /e/OS-Q v.1.5. Strange, isn’t it?
