Maintenance Menu on BT DTR-T21*0 Youview+ box.
1. Turn off the DTR-T2100 using the switch at the back of box. Leave off for 30 seconds.
2. Manually switch the TV to the associated HDMI or AV (Scart) port.
3. Hold down the down arrow button (the button between the OK, Power and Record buttons on the Control Panel on the top of the box) whilst powering on the DTR-T2100 using the switch at the back of the box.
4. Keep holding down the down arrow button as the “BT Logo – Waking Up” screen appears.
5. After a few seconds the "Enter Maintenance Mode Y/N (Y: POWER)" message appears towards the bottom of the screen. Immediately release the down arrow button.
6. Press the Power button once on the Control Panel on the top of the box. (A small amount of patience is now required) The "Enter Maintenance Mode Y/N (Y: POWER)" disappears from the BT Logo – Waking Up screen. After several seconds the screen goes blank. After several more seconds the Maintenance Mode menu finally appears.
7. Select the Recovery option required using the Up and Down arrow buttons on the Control Panel on the top of the box and use the Right arrow button to confirm the option.
Thanks to forum member Le_Blur who posted this in YV Forum.
