As the new beta bootloader was released, I tried to upgrade it as usual (on official LE 9.2.5 it was working) but failed:
# rpi-eeprom-update -d -f /tmp/pieeprom
BCM2711 detected
Dedicated VL805 EEPROM detected
*** INSTALLING /tmp/pieeprom ***
grep: /var/lib/dpkg/info//rpi-eeprom.md5sums: No such file or directory
cat: can't open '/var/lib/dpkg/info//rpi-eeprom-images.md5sums': No such file or directory
md5sum: /tmp/tmp.C1K9IA: no checksum lines found
rpi-eeprom checksums failed - try reinstalling this package
Unable to validate EEPROM image package checksums
The current LE 9.80 Nightly installed:
LibreELEC-RPi4.arm-9.80-nightly-20201105-57711b6.tar
Raspberry Pi Tools add-on installed: 9.80.7.107