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To reboot a i2002 or i2004:

mute - up - down - up - down - up - mute - 9 - rls

and then press the four buttons underneath the display.

Interesting things happen when you choose another digit than 9 ...
•0 key - Display Firmware hard version
•1 key - RAM check
•2 key - DTIC check
•3 key - EEPROM check
•4 key - Xmt, Rcv, Attenuation levels
•5 key - TCM loop back test, between i2004 and CE equipment
•6 key - unassigned
•7 key - Display Firmware hard version
•8 key - TCM BERT test
•9 Release - Reset set/power cycle
•* 2 - RUDP on/off check. If RUDP is off, power cycle the set (9 Release).
•* 0 - Display Firmware soft version