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The replacement RT4 is still on the original 7.02 software. I'm planning to try the upgrade with the ISOs available here as the dealer is reluctant! I use a standard SIM and it works well. The original RT4 unit used to reset quite a lot (other posts have commented on this). The replacement never has (yet!), during daily use for 9 months, which makes me think perhaps the problem in hardware related?
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