- Did someone take the OTA upgrade from 1.8.1-r to 1.9?
- Does it offer / say I would upgrade to 1.9-s (from r) ?
- Did someone successfully do such an upgrade?
There is no /e/OS OTA upgrade for the Pixel 4a.
OTA upgrades need to be prepared by the developers per device per upgrade step, this is serious work and needs time.
Please refer to the posts in https://community.e.foundation/tag/development-updates to get info regarding available and planned OS OTA upgrades.