*do at your own risk
I bricked it once and got it swapped for free, change from ONR to ONT mode while in the support account. You will no longer be able to connect to the device web menu @192.168.1.254 neither will the device connect to the internet. Call 1688, go full dumb and act like you woke up to a broken internet connection. Con is you won't have internet until they come and swap your ONR.
The better way is to first do a USB backup onto your FAT32 thumbdrive (Management & Diagnosis > System Management > USB backup) then switch the ONR to hybrid mode. Internet will be down in hybrid mode but you can still access the device web menu. Call 1688 and complain as above. After booking the tech appt use the USB Restore option in the web menu to revert it back to the old working config. Internet will work perfectly fine.
BTW, my ONR is stuck on firmware V2.1.10P5N10(without the new bridge port option) , tried rebooting via the web menu and disconnecting-waiting-reconnecting in the hope it can catch the new *N15 firmware to no avail. Anyone knows how else to get the ONR updated without having the tech swap the ONR?