No, 5Fx = MIB1; 6Px = MIB2. All explained in the top link I posted (post #4).
People can manually hack a mib2 card to give a 5F on the screen (there was a mistake at one point where 5F appeared in the manufacture as I recall) but since the
sticker says 5F in the picture it's mib2. As you said updates for mib1 finished in 2020 so you'd only get to 2020 release with a dealer update.
Nobody to my knowledge perfected a user mib1 workaround. You think you would need to write the navigation FeCs which people are also doing with mib2 standard now these days as well as the workaround (that one caused the unit to do it, itself as if it was getting a first time card I suspect by moving the overall.nds file between releases, the error flag generated which can be ignored is one of two navigation FeCs in the unit). For the FeC method they use a backdoor method in the mib2 tool kit(s) which was never closed in mib2 to get code into the unit, then another back door via a developers area in the code to write the FeCs. For mib2 standard that's more hassle than the workaround. For mib2 high for DIY you can use the 1447 AIO release to do it via a firmware upgrade seems plenty of recent success on that one, or for specific firmware that the unit is on the mib2 toolkit. Conversation and links on the mib2 firmware thread for that.
Back on subject as far as mib1 DIY techniques appear thin on the ground. Possibly somewhere on the internet something for mib1 might be found but suspect not. If it was it wont by DIY for the average person.
Call the genie up for pointers
@Chillout - probably a retrofitters / hobbyist work bench thing over DIY skills if it exists. Dealer could do it at a cost if they are still tooled up. A fair few people ripped out mib1 units and put in mib2 but by 2025 updates will probably finish on that.... mib3 anyone. East Yorkshire Retrofit I'm sure would be up to a retrofit task for mib2 if DIY for the original poster isn't one they fancy on changing the unit.
You find threads on fitting mib2 units. They have to be prepped not a question of picking one up from a brakers yard, that was an early mistake that people made. Retrofitters prep them for DIY or offer the fitting service. Then join the ranks of
Leon mk3 owners that had mib1 units ripped them out and put mib2 units. They love the car more than the original infotainment unit and swapped out. You get the sort after Car Play and Google Maps with that route.