SIM SIMAX1800U: OpenWrt Compatibility Report
The SIM SIMAX1800U runs OpenWrt 25.12.2 on the ramips/mt7621 target, and has been supported since 25.12.0. Its WiFi 6 (AX) wireless on the mt76 driver rates good for open-source driver support (0.80/1.0), installation is rated moderate, and we have no current US retail listing for it.
Hardware data and retail listings last checked .
Where to buy
We have no current retail listing for the SIM SIMAX1800U, which is no longer sold new. See current alternatives for devices you can still buy today.
Specifications
| SoC | MediaTek MT7621AT |
|---|---|
| CPU | 2 cores @ 800 MHz |
| RAM | 256 MB |
| Flash | 128 MB (NAND) |
| Ethernet ports | 4 |
| WiFi generation | WiFi 6 (AX) |
| Radios | 2.4GHz: b/g/n/ax · 5GHz: a/n/ac/ax |
| WLAN hardware | MediaTek MT7905D, MediaTek MT7975D |
| WLAN driver | mt76 |
| OpenWrt target | ramips / mt7621 |
| Package architecture | mipsel_24kc |
| Current release | 25.12.2 |
| Supported since | 25.12.0 |
| Install method | see git-commit |
| Install difficulty | moderate |
| Power supply | 12 VDC, 1A via barrel |
| Device type | Home router |
| Estimated throughput | 200 Mbps |
| Availability | not_available |
Installing OpenWrt on the SIMAX1800U
Installation on this device is rated moderate. Expect to use a recovery mode, TFTP or a vendor tool rather than a plain web upload. Documented methods: see git-commit.
Flashing third-party firmware can brick a router and usually voids the warranty. Always check that the firmware image matches your exact hardware version.
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