How to reset factory settings on a Casio SE-S400

SOURCE: I bought a second hand register casio se-s300. can

Turn key to PROGRAM mode. Turn power off at wall. Hold FEED down - keep your finger on it. Turn power on at wall. Wait 5 seconds, then let go of FEED. Press SUBTOTAL.
After power on. You are ready to get going.

SOURCE: How to reset factory settings on a Casio SE-S300

How do I reset the cash register?

116ER, 117ER, CE2300, CE2350, CE2400, CE280, CE285, CE300, PCR202, PCR204, PCR308, PCR408, PCR350, PCR355, PCR360, PCR365, PCR450, PCR460

This will erase all information - Remove AA batteries and unplug register from wall for 15 minutes.*

If resetting does not work this indicates issue is repair level.

PCRT465, PCR465A, PCRT2000,

This will erase all information - with the PGM key at Off press and hold down the Feed button, while holding the Feed button turn the PGM key down to the PGM mode Release the Feed Button ----INI should appear or a group of 8 zeros

If resetting does not work this indicates issue is repair level.

PCRT470, PCRT480, PCRT48S, PCRT2100, PCRT220S

This will erase all information - with the PGM key at Off press and hold down the Feed (journal) button, while holding the Feed button turn the PGM key down to the PGM mode Release the Feed Button ----INI should appear or a group of 8 zeros, now press one of the below

22500 Subtotal (PCRT40, 480, 48S)

Or

23000 Subtotal (PCRT2100, 220S )

Wait for a receipt to print.

If resetting does not work this indicates issue is repair level.