If you’ve used Emunand for CFW (and stayed offline in CFW), why couldn’t you go back into OFW and online just to update?
Thats how you update OFW.
Only way to update emunand righ now on Mariko is to disable stealth then update through Horizon OS, reboot and stealth is back on. Some don't feel safe updating this way. I've never been banned for this but you never know.
Im sure TX is making their own app. Also many are reporting not being able to boot past nintendo and or switch logo (Not exfat driver related) on OFW and or CFW with SX Core so we need an unbricker in their pre boot menu. Looks like EmuMMC can get corrupt and stop the Switch from booting either side.
We need someone to update Choi if possible to write the new Mariko banks with the required data correctly.