Products > Terminal Test Products > 4208 Off-Air Mobile Tester > FAQs > H

4200 Series

H. I have an old unit, which I want to update to GPRS.

If your unit has a serial number below 613 XXX then you need the hardware upgrade, which can be performed in a Willtek Service Centre. If in doubt, where to find the next, please contact the Willtek Service headquarters in Munich.

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