An apology for writing in my first language, thanks for reminding me the main language of the forum. Now, I followed the following steps that you already described in the first post:
Check for a system update through Settings > System > Software update.
Restart your Roku device through Settings > System > Power > System restart.
I have installed and uninstalled the HBO Max channel on my ROKU Premiere device but it hasn't worked, as I always keep getting stuck at the screen suggesting me to upgrade the channel to MAX (blue icon).
While I don't experience this issue on my 4800R, I notice severe audio volume issues with this app. My AVR is 100w/channel and when viewing content on Max I have to crank the volume to almost 50% to get a decent listening volume. Compared to Tubi or Prime, its ridiculous. I also find the lag annoying and its obvious HBO failed to correct it from the previous app iteration. Thanks
Power User (film maker) Mill Valley, CA
Jonathan Roku Ultra 4800R; LG OLED55B7A, ONKYO TX-NR636, Panasonic Blu Ray, Definitive Studio Monitor 450 (L/R), Definitive LCR 2000 (center), Definitive 10" sub-woofer, Definitive surrounds. Motorola MB8600 modem. Asus RT-AX68U WiFi 6 router. Western Digital Power Line network adapters