Yesterday I've posted related to Mathieulh twitter post (
here) But thread isn't popular and I didn't get answer, so I will ask here

Similar problem we have with 3.41 games tried to run on 3.15 firmware. So when we change FW version in param.sfo also there is 0x80010019 error.
Does It also mean that self/sprx can't decrypt?
I wonder know if we can move appldr (or keys) from higher FW to lower. Such solution would not help people with 3.41 to run 3.42+ games because appldr can't be dump on 3.42 which has not been exploited. But what if we have two exploited firmwares? Maybe it is possible to dump 3.41 appldr and move it to broken 3.15?