If you have the bone running try:
bone$ /opt/scripts/tools
bone$ sudo ./update_kernel.sh --bone-kernel
[sudo] password for debian:
info: checking archive
-----------------------------
Kernel Options:
ABI:1 LTS44 4.4.145-bone23
ABI:1 LTS49 4.9.178-bone15
ABI:1 LTS414 4.14.198-bone40
ABI:1 LTS419 4.19.142-bone56
ABI:1 LTS54 5.4.70-bone38
ABI:1 LTS510 5.10.0-rc5-bone4
ABI:1 STABLE 5.8.18-bone23
ABI:1 TESTING 5.9.1-bone12
ABI:1 EXPERIMENTAL 5.9.1-bone10
-----------------------------
Kernel version options:
-----------------------------
LTS414: --lts-4_14
LTS419: --lts-4_19
LTS54: --lts-5_4
STABLE: --stable
TESTING: --testing
-----------------------------
Please pass one of the above kernel options to update_kernel.sh
Looks like 5.8 or 5.9 should work.
--Mark