Good to hear ! 
Just a thought … and something of a [Community self help proposal]
@piero is an expert at predicting for this 2019 device
… but users who have been though a “trouble free” upgrade process might share the Vendor security patch level as revealed in
About phone > Android version
This would allow a cheerful wiki editor to start to compile a “List of final firmware release dates”.
Why ?
- Individual users spend a lot of time finding this information with certainty for their own device.
- It is more easy with devices of a certain age, eg my Samsung A3 (2016).
- Devices with a vintage of say 2019 - 2021 (around 2 - 4 years old) are much more difficult to be certain, and one rarely finds (in an online search) the good information as provided here by @piero.
Example entries for the proposed list
| /e/OS build / ROM | Vendor Security Patch level |
|---|---|
| 1.13-q-202307283148839-dev-a3xelte | 1 August 2019 |
| 1.13-r-20230725-Unofficial-a3xelte | 1 August 2019 |
| 1.13-r-20230725-CUSTOM_SLIM-bacon | 1 September 2016 |
| 1.10-r-20230412278811-stable-dreamlte | 1 April 2020 |
| e-1.11-s-20230512288805-dev-miatoll | 5 June 2022 |
a copy the format for an entry
| full name of successful build | date |
Position of the pipe | character is not critical !