[Q] [HELP] unlocking and upgrading MIO digiwalker A702

hello guys..
straight to the problem
i've got this PDA from my friend. the brand is MIO A702
it's a PDA embedded with GPS sort of thing(i didn't know how to activate it)
it has this specifications :


GPS PDA Phone System - A702 Specifications
CPU 200 MHz (TI OMAP 850)
GPS Chipset 20-channel SiRFstarIII
Networks GSM Quad band (850, 900, 1800, 1900) GPRS, EDGE
Memory / ROM 1GB
Memory / RAM 64MB
Memory Slot MicroSD (Support HCSD)
Display Type 2.7" Anti-glare touchscreen TFT
Resolution 240 x 320 (QVGA)
Display Orientation Landscape/Portrait
Battery Capacity 1130mAH
Battery Life 200 hrs (Stand by time) 4 hrs (Talk time)
Bluetooth Technology V2.0
Wi-Fi 802.11b+g
USB V1.1
Camera 3.2 megapixels (With Autofocus and LED Flash)
Microphone Yes (Built-in)
Speaker Yes (Built-in)
Earphone Jack 2.5mm
Depth 16.5mm (0.65")
Width 57.5mm (2.27")
Height 110mm (4.33")
Weight (grams and ounces needed) 148g (4.76oz)

and its rom when startup screen is R39.5.115
but my sim card wasn't detected, i think it was locked..
so ... do i have to HSPL it? downgrade the radio and install it again..
i've experienced upgrading my HTC touch to win mobile 6.1
but it almost 1 year a go..and someone in this forum helped me in the progress, .
i wonder you guys can help me to unlocked and upgrading the PDA


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