My device came with the firmware shown as 7500. I've tried updating to the latest 7600 but the firmware update tools don't work. Show the SIM card and show that it is connected to the network, but errors occur when trying to install SSL. I was able to download and view the certificates, but trying "AT+CSSSLCFG="sslversion",0.4" just throws an error. I don't know if this is due to a firmware mismatch, I'm waiting for support. I have contacted Waveshare several times but no response yet. I will update if I can get this device working.
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