I have it at the latest firmware. Regarding factory reset, I couldn't find the key sequence.
sorry for the long post.. Since am a novice was not sure if i could post any direct link to the source hence i have copied the content found from manualslib website and sharing it here, hope its the correct one and is helpful
6. SERVICE MODE
6.1 SERVICE MODE
1. Service Mode
When the device is put in the Service Mode, the dedicated menu starts up.
As long as the menu is open, the Service Mode is in operation.
The items implemented by the menu are as follows:
· Check of Versions for MainCPU / SubCPU / DSP
· Check of Model Information (For which is SubCPU in operation, N-30(N-30-K/-S) or N-50(N-50-K/-S)?)
· Check of Network Information
· Update of USB for MainCPU / SubCPU
· Check of the number of protection circuit detections and clear
· Factory Setting
In the Service Mode, the protection circuit detection operates in the same way as during in the normal operation.
2. How to enter the Service Mode
Enter "ESC(A85F)" -> "+10(A81F)" on the service remote controller GGF1381 while the power of the Main Unit is
ON, and the menu for the Service Mode starts up.
∗ If any input from another remote controller is made between "ESC" and "+10", the Service Mode is not entered.
The entry status of the "ESC" key is cleared at the time of Power OFF.
3. How to leave the Service Mode
When the menu is left, the Service Mode exits.
The menu is left by switching of functions, Power OFF or the return key input on the top-end layer of the menu.
4. Menu
The operation of the menu shall be conducted with the cursor keys of the product's remote controller.
Use the Enter key for selection of an item and use the Return key for return of one layer.
Note->the last option under Service menu is factory reset
Rgds
