Hello,

I’m experiencing a recurring and highly disruptive issue with the TP-Link Archer MR500 router when using a Digi.Mobil Portugal (Digi PT) 4G SIM.

The internet connection is intermittently functional — sometimes it works for 1 day, then it stops working for 3–4 days in a row. During those times, the LTE appears connected, browsing and messaging works good, but **Netflix, HBO Max (on SAMSUNG TV) and iRobot fail**. They report connection issues or reject the connection with an **IMEI-related error**. Youtube works fine!

Here are some key points:

- The **same SIM card works perfectly** in another smaller TP-Link router (model TP-Link M7350), without any issue. It detects Digi PT profile from the start without any settings!
- The MR500 produces persistent log errors:
  - “**Unsupport PLMN, cannot find the section**”
  - “**Do not find the mcc mnc for the imsi 268020000324178**”
  - “**Profile load operation failed**”
- The IMSI used corresponds to **MCC 268 / MNC 02**, which is **Digi.Mobil Portugal**.
- The APN is set correctly to `internet`, with no username/password.
- DNS resolution (8.8.8.8) sometimes fails with `resolve timeout`, even when LTE status shows "connected".
- Netflix, Max, and iRobot all return errors like "cannot connect", or indicate the **IMEI is not valid for streaming access** – suggesting the backend services reject this type of network configuration.

It is clear that the current firmware on the MR500 does **not include a valid ISP profile for Digi PT**, and this causes network identity rejection or misrouting. Or there is a problem with MTU value, but looks like i can't change it from web interface!

Can TP-Link please:
1. Confirm if MCC 268 / MNC 02 is supported in the latest MR500 firmware?
2. Provide an ISP upgrade file or manual method to add this PLMN profile?
3. Any beta firmware ?

Router details:
- **Model**: TP-Link Archer MR500
- **Hardware version**: V1
- **Firmware version**: Build 241219 Rel.42593n 
- **SIM**: Digi.Mobil PT (MCC 268 / MNC 02)

This issue is extremely frustrating, especially as the same SIM works on other TP-Link routers.

Thanks in advance for your support!