vexos consists of two parts, the “invalid assets” screen is shown when the version of the two parts does not match, The most likely cause is an incomplete vexos firmware update.
My only advice is to force update using the V5 firmware update utility.
old instructions are shown here, but nothing has really changed since then, except latest vexos is 1.1.1.
Make sure the firmware update utility is the only application communicating with the V5, that is, close VEXcode and any other applications (visual studio code with VEX extension, web based VEXcode in chrome etc.) that may be trying to communicate with the V5,
An update is in two parts, you will see a progress bar appear on the V5 twice.