Firmware stuck at 5.34

[jeey]

Had an old uzb stick that hasn't been upgraded in ages (5.07), so i started updating it to the newest version.

But i can't find any versions past 5.34 in the UI?
According to the firmware page 5.39 should be the newest one?

Any reasons why i cant upgrade past these versions ?

[jeey]

Seems like i had to downgrade to 5.27 and upgrade to 5.36 and then 5.39