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Thanks for clearing that all up for us @Macco26. Now I am even more confused. If the BIOS has come from TF with the MUX disabled I doubt it is a mistake. In my mind thats more worrying than it being turned off accidentally.Both BIOS are made by Tongfang upon specifications of PCS, but PCS admitted to me they barely send some feedback, so generally is a genuine Tongfang version 100%, that's all.
First bios was 1.04PCS, second one (with MUX) disabled 1.07PCS. PCS today admitted also they didn't tell anything to TF about any reason to remove this. They got the new BIOS as it is. And used for their laptop unaware of this lack.
Why did it happen? We don't know. That's why I want a minimum of reassurance TF is working on a newer version. Because if at 14+1 days from my delivery I get a response like "sorry, TF decided the MUX wasn't reliable enough, they are not readding it" I would be screwed.
PCS also told me they don't have files for the 1st BIOS. Because it came inside the laptops. They only have 2nd BIOS on update files.
Plus I don't know if reverting a BIOS is an easy task. Sometimes the app does check and progress only if it sees a newer version to be applied. So TF should AT LEAST refactor the 1.04PCS BIOS to let be no less than e.g. version 1.08PCS.
Plus, and I'll stop, we don't know what other changes they did in 1.07PCS. Maybe they don't want to get rid of those. So we need a 1.07PCS BUT updated because the MUX is back.
This is very similar to the battery issue in the Vyper. PCS had to go back to PCS to get the flash files and it took a few months. When it still didn't work they ended up refunding everyone so I would say you should be OK. At the end of the day you bought a laptop which was advertised as having a MUX so it should have one.