Hi,
for Duo2 there is a solution:
Connect via Telnet
opkg remove vuplus-shutdown and then the Duo2 will perhaps shutdown so you have to restart it
Connect again via telnet
opkg update
opkg upgrade
reboot
Connect again via telnet
opkg install vuplus-shutdown
Because of the huge amount of updates backup, reflash and restore might be faster.
ciao
my Solo2 is still on Apollo 3 never seen any updates to 4 or even 5have I missed something