I tried to update my Frameo device with a newer webview, by following the instructions on the Immich Kiosk and ImmichFrame docs.
But I got blocked.
root@BGS-102K-T:/ # mount -o rw,remount /system && cp /system/app/webview/webview.apk /system/app/webview/webview.apk.bak
cp /system/app/webview/webview.apk /system/app/webview/webview.apk.bak <
mount: Operation not permitted