Epson TM-T88VI-iHUB Reference Manual page 70

In 1 and 2, the following guidances are printed, the Paper LED flashes, and instructs the user's operations.
70
1. Continuing self-test guidance
2. Mode selection guidance
Mode Selection
Modes
0: Exit and Reboot Printer
1: NV Graphics Information
2: Receipt Enhancement Information
3: Customize Value Settings
4: Restore Default Values
5: Interface Setup
6: TM-Intelligent Information
7: Peripheral Device Information
8 or more: None
Select Modes by executing following
procedure.
step 1. Press the Feed button less
than 1 second as many times
as the selected mode number.
step 2. Press Feed button for 1
second or more.