I recently bought a switch with 3.01 firmware and serial number that according to the serial numbers ( XAJ40052X and below category) thread it is not patched. I also have an 128 GB card that is exfat and I am awaiting for SX dongle. I haven't done anything, not even connected it online.
Based on my understanding of what I read in this forum one needs to do a NAND backup, but 3.01 does not support exfat cards, unless you update. But older firmware is supposed to have more vulnerabilities. Plus wouldn't Exfat memory card that switch recognizes be needed for RCM? And for use of Sx-OS or hekate.
Also, there will be a new update, so I might need to update soon to 5.1 before version 6 comes.
Then there is another update offline method (ChoiDujourNX) that allows to reverse if I want to, but apparently it will have autoRCM enabled which might be somewhat dangerous? What happens if battery runs out? Can you use the default horizon operating system with it? In a thread I can't link to as a new member it was called dangerous.
Then there is the creport option that apparently Sx-OS does not have (ideally it and Xci seem best combo, seem people claim that it is harder to be banned with XCI, maybe hekate only would be better but SX option remains)
There are also threads about keys here that are confusing.
Sorry for my very noobish confusion.
Update to 5.01 now by inserting my exfat and just use the dongle
Or try to use ChoiDujourNX, after formating my card in Fat32, backing nand there, and trying to use Choidujour?