Are you able to confirm the version of Firmware you are seeing when you use InControl2, you can upgrade from there as a alternative?
I can confirm the current offering on the Peplink website has an error in the URL, though the firmware for a Balance 50 is the same as a Balance 20 and a Balance 30 from past experience.
You can get the firmware for Balance 50 Version 7.0.0 with this URL of
(same as on the website for a Balance 20 & 30 LTE).
Hello Peplink Support,
The incorrect URL that @seaward has mentioned above appears to also be in the Firmware page for 6.3.3 incorrectly too (URL of https://www.peplink.com/support/downloads/firmware-6-3-3-and-user-manual/), the best representation of the firmware for these models appears with Firmware release 6.2.3 where the four models have been consolidated into the one button as in the attached image below.
Happy to Help,