DEM-3000

"DEM" most probably corresponds to: Developer Engineering Model

3000 is the 3rd iteration of a Handheld Gaming Console from PlayStation (1000 was PSP)

The letter G/H/K/L.. describes the generation followed by the 4th & 5th digit of the serial number.
DEM-3000JEC is the only exception

Revisions

Model	Date	Stage	Serial	TG code	SubCode	Motherboard	CP Board	IDStorage String
DEM-3000G			6XYZZZZ	00-TG930YXK
DEM-3000H		"DVT2"	6XYZZZZ	00-TG940YXK	0x5	IRT-001 #04	GCP-001 #02	0001,0012,0012,0001,0001,2,1,1,1,00.945_20110119_01_E,0.0.4.0_20101207_01_E
DEM-3000K		"New EVT"	7XYZZZZ	00-TG9A0YXK	0x9	IRT-002 #03	GCP-002 #02
DEM-3000L		"NEW DVT1"	8XYZZZZ	00-TG9B0YXK	0xB	IRT-002 #06	GCP-002 #03	0001,0030,0032,0001,0001,2,1,1,1,00.995_20110606_01_E,0.1.3.0_20110525_01_E,1
DEM-3000P	2011-08	"NEW DVT2"	9XYZZZZ	00-TG9C0YXK		IRT-002 #06/07	GCP-002 #07
DEM-3000JEC			9XYZZZZ	00-TG9C0YXK
DEM-3000JEC	2011-09	"PVT"	02XXXXX	00-TG9D000K	0xF	IRT-002 #10	GCP-002 #10	0001,0044,0048,0001,0001,2,1,1,1,01.000_20110930_01_E/devtool,0.1.8.0_20110920_01_E,1

X Area 0 JP 1 US 2 ASIA 4 EU

Y Color 0 Black

Serial

A B C Z Z Z Z
│ │ └ Color? (always 0 since all are black)
│ └ Target Area
└ Generation