Ok let me get back to this. I originally posted everything went fine after the update. However I didn't use the bike yesterday other than checking if it would run (and it did). The bike wasn't plugged in and sat around 80% soc.
Overnight I let it charge up to the usual 95% and this morning for the first time ever I couldn't use it because it didn't want to release my charge cable. I tried every possible combination and sequence of turning the bike on and off, having the cable plugged in the wall socket or not, breaker tripped in the cable or not.
It was charged up tot the 95% so also didn't charge when I gave it power. Then I tried removing the charge limit and it started charging but always just for a little while, never longer than a minute. Also the dash sometimes stayed on while turned off or didn't show the charging dash. Even once had a square underneath the SOC value with just noise, like you used to get on televisions.
I did see some error codes, 35 and 38 so I also tried going into the menu te remove all errors one by one. That didn't help.
In the end I removed the seat and the plastic part at the key lock for the seat to access the 12V battery. Removed the negative terminal and within 30 sec I heard the lock release. Luckily that worked. So now I keep a T30 for the main seat, a T25 for the plastic and a No 10 socket for the terminal just in case.
Edit: not so much an issue but also new on my bike since the update is that all the warning lights besides the LCD panel in the dash now light up when I turn the bike on. Before that was only like engine and abs. Now even the blue full beam indicator lights up.
Edit2: keeps doing it. Had to disconnect 12V battery again to get the cable released :-(. This time with another cable to a type2 charger, so it's not cable/charger related. It's the bike. I'm heading to my dealer now since he's replacing the front brake switch for the brakelight. Let's see what they can do.