Try this one. Just replace browser.pyc in folder /usr/lib/enigma2/python/Plugins/Extensions/Chromium/ with this one.
User agent is changed from "Mozilla/5.0 (X11;CrOS armv7i 13982.88.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/100.0.4896.127 Safari/537.36" to "Mozilla/5.0 (X11;CrOS armv7i 13982.88.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/139.0.0.0 Safari/537.36". Except User Agent all other is not changed at all.
Of cause rename it to: browser.pyc
