I bought the cell phone with A12 (a half year ago)
I downgrade to A11 because this was necessary vor installing e
I followed this: Install /e/OS on a ASUS ZenFone 8 - “sake” for installing S and 1.5
but I did something wrong … I went to a12 first
and then followed the instructions, flashing vendor_boot, recovery = OK with recovery , reset and update , adb sideload…all = ok but
Signature verification failed error 21
E:Current SPL: 2022-11-05
Target SPL:22-10-05 this is considered a downgrade
E: denying OTA because it’s SPL downgrade
and you used e-1.6-s-20221201239247-dev-sake.zip ?
to me it seems you have Android “parity” already with stock on A12 and /e/ S (A12), but stockrom is still farther ahead
not sure about the (is it patchlevel date?) of the e-1.6-s spl, but I’d assume it to be farther ahead but can be wrong so you’d need to wait for a newer /e/ build or reset vbmeta… but never faced this so my knowledge is lacking on this
You may try to use the oldest vendor_boot.img available, instead of the latest.
Last week I tried with the latest and I had the same error “downgrade, aborting”
But with an older one (2022/11/04 for me I think), I had warnings but I still have the choice to overpass them and start the installation
I tried the last and penultimate vendor_boot without success
I also tried the vendor from half a year ago (with A11) and boom then it does work /e/ 1.6 is running.
Those were fearful hours again
thanks everyone and especially jacquarg with the solution
I’m stuck in the same situation. Latest eOS does not install because it is considered as downgrade. Before trying to install I had upgraded to the latest release of Asus Android 12 Version (WW-31.1010.0411.138).
After several failed attempts to install eOS (e-1.6-s-20221201239247-dev-sake.zip) I’ve tried latest release of LineageOS, which worked fine.
Then reinstalled Asus Android 12 (Version WW-31.1010.0410.61) with Android13-Beta-OptOut-Tool from Asus.
Joyfully retried installation of eOS, as I assumed my Android version is now old enough for eOS not to be considered as downgrade. Was a bit bummed out, when getting the same error message.
Unfortunately the oldest vendor_boot.img is not from Nov 19th, which doesn’t solve the issue.
Any hints? Where can I find an older vendor_boot.img? Is there any other solution?
Any support is appreciated!