Gave up on trying to "fix it"
Booted to Recovery, reinstalled the OS, downloaded SecUpd2022-004
Run it and this time it went with no problem, restarted, updated
sw_vers
ProductName: Mac OS X
ProductVersion: 10.15.7
BuildVersion: 19H1922
SoftwareUpdate picked up Safari 15.5, installed...
macOS Catalina 10.5.7 with Security Update 2021-008 (19H1615)
On OC 0.7.7 with SIP set to 77000000 (also tried with 67000000 and 0)
Check for updates mostly never completes (done once but failed to install anyway)
So downloaded SecUpd2022-003CatalinaManual.dmg (and also 004)
It will not even...
Unlikely...
it is I2C Trackpad, so would be VoodooI2C, as per this
but latest version 2.6.5 does not help either
HID\DELL0816&COL03
Manufacturer: ALPSALPINE
on Intel(R) Serial IO I2C Host Controller - 9D60
Few bits are not correct for Sanity Checker
I can boot Recovery USB with Catalina 10.15.7, but if I try to boot already installed Catalina 10.15.7 I get only StartImage failed - Aborted
00:000 00:000 AAPL: [EB|#LOG:INIT] 2021-03-10T18:51:01
00:050 00:050 AAPL: [EB|#VERSION] boot.efi...
There is no real need to "install" Clover to USB, copy of EFI folder to EFI partition is all that is required
The rest of the process does also work for Mojave/Catalina, but...
com.apple.recovery.boot does not exists any more (since Mojave?)
In Mojave/Catalina, one must rename copied folder...
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