SamyGO

No. No solotion yet. I've taken an Amazon Firestick...

I am afraid you have no other cvhance than to upgrade and eventually dowgrade if the problem is solved.
Unlikely I cannot do it because myTV do not allow the upgrade (stops at 38%)

Check the USB and verify it is not corrupted. Otherwise you have to root again.

Contact Samsung Service and they will provide you with a new FW for end users that will solve the issue (according to them...).
In my case I could not try because the FW upgrade process fails due to a memory issue in my TV.

You are in a better situation than me. I have no access to Samsung Account (grayed out).
I suggest you contact Samsung center. They have a service FW that solve your problem.
I have it for my TV but unfortunately the upgrade process to my TV stops at about 30% and the upgrade fails..

Also rooting the TV is not a solution... I lost few weeks on this issue and I did not solved it.

This looks very similar to what happened to me: https://forum.samygo.tv/viewtopic.php?f=66&t=13340 What is your TV model ? I'm not sure this is realtaed to the root itself but in some way it seems related in such a way that the root is keeping a big part of the TV storage and the SH fail to update a...

In the discussion it is explained that the widget appearing is quite tricky.
You have to try with USB in and switch ON or viceversa or even when you are already in SH insert the key.

If the file structure in the key is OK at the end you will succeed.

You can downgrade with FW 0000 and then upgrade again.

Wow ... risky job [emoji6]. I will have a look but 22 inches J serie smart does not exist. I have to look for a 32" and hope the panel will work. The physical fit is the last of the related problems. It would be interesting to open a section for this kind of jobs that will become hot in a couple o y...