mobile network sharing problems

[gas24]

Please help to solve this problem:

1. I have a HP EliteBook 840 G2 laptop, with built in 4G modem. I have a SIM card in it, and I can simply share my mobile connection with Windows built in Mobile Hotspot function (Start > Settings > Network & Internet > Mobile hotspot), and worked perfect from other computer

• OS: Windows 10 Pro, 64bit (Hungarian, so error messages are translated, not the exact English text)

• Wireless: Intel Dual Band Wireless-N 7265

• 4G: HP lt4112 Gobi 4G Module

• SIM: T-Mobile (Hungary)

2. situation: I need to use another SIMcard. It works normal, except, that I can't share the connection, when I try turn on sharing, a message appear, that can't turn on hotspot, because there is no mobile connection.

Then I called T-mobile, but they said, that sharing must working with both card, the problem is with the computer.

I tried two other SIM cards, and an other, same type notebook. The result: simple connection OK with all SIMs on booth notebooks, but wifi hotspot sharing is on notebook 'A' works with SIM 1 & 2, on notebook "B" works with SIM 2 & 3 (neither notebook can share SIM 4 connection).

3. situation: I googled a lot for solution, but found no similar case. The most similar was "wifi hotspot not working after upgrade windows x to windows y". I tried a lot of suggestions:

• remove, update and reinstall wifi and 4G drivers

• disable and re-enable network devices in device manager and in Network and Sharing center > adapter settings

• netsh wlan commands (with non of the SIM cards worked, "the group or resource is not in the correct state to perform the requested operation")

• third party hotspot applications (Connectify: can’t try, because free version not support mobile network sharing, OSToto Hotspot: can’t find wifi adapter, mHotspot & Virtual Router: "the group or resource is not in the correct state to perform the requested operation")

Result of my tries: the previously not shareable SIM connections continuous not shareable, and the previously working SIMs connections can share, but no internet access on the shared network.