Can't link the FAQ but:
Or try connecting via USB cable for pairing, a feature added in M30 firmware v14 "Added bluetooth pairing function via USB cable on Switch mode."
Think this is it, but I have no idea for sure really. Be sure to pay extra for a non-terrible shipping option, Yanwen are glacially slow.
Can't post links but it's "/item/32976982364.html" or "/item/32979839850.html" on AliExpress
There's a thread with the title "Switch NAND upgrade" here. The author Pascoe has a fantastic English write up on his site which I can't link yet but I'm sure you can find.
bnstemp shares his process on a Chinese board, Google this and throw it in Google translate "[教程] 【教程】升级switch内置储存"
Here's my short review
+ Tiny!
+ Super easy to change out payloads, use a micro usb and it's just a regular folder. Swap out the payload.bin and it's sorted
+ Wee LED is great, can tell which payload is on
+ Site had clear english instructions
~ Build quality is quite good, except it doesn't...
Direct upgrade from leak->6.0.0-5.0 worked fine for me with the latest ReiNX + ChoiDuJourNX. My 6.0 update had 211 files, perhaps you've got a corrupt/incomplete version
Rum pecan ice cream is the bomb. Never had rum raisin, but bet be good. My homemade ice cream machine started rust inside so I pitched it, but gotta get a new one, miss making my own ice cream, esp with booze.