UniElec U7621-06 MediaTek MT7621 Router Supports OpenWrt, Padavan, and PandoraBox Firmware

UniElec U7621-06 is a router / gateway based on Mediatek MT7621 dual core/Quad Thread processor, and offered either as a board only or complete system with optional WiFi and/or LTE PCIe modules.

While the board is said to run OpenWrt or firmware based on Mediatek Linux SDK , the company also mentions the board runs Breed bootloader that can be used to  upgrade the firmware through a web interface. UniElec claims the router supports alternative firmware such as Padavan or PandoraBox.

UniElec U7621-06 specifications:

  • SoC – Mediatek MT7621 dual-core, quad-thread MIPS1004K processor @ up to 880MHz
  • System Memory – 256MB DDR3 (optional 512 MB)
  • Storage – 16MB NOR Flash (optional 8/32/64MB), 1x SATA 3.0 port, 1x micro SD card slot
  • Connectivity – 5x Gigabit Ports (4x LAN, 1x WAN)
  • USB – 1x USB 3.0 port
  • Expansion
    • 2x “normal” mPCIe for 802.11ac or 802.11n WiFi module
    • 1x mPCIe connector for LTE or mSATA module
    • 1x 30-pin GPIO connector
  • Debugging – 1x 4-pin Serial Debug Port
  • Misc – Reset buttons, LEDs (power, LAN, LTE, 2x user), watchdog timer
  • Power Supply – 12V@1A
  • Power Consumption – 8 Watt (Max)
  • Dimensions – 188.5 x 128.5 x 25 mm (aluminum alloy case)
  • Certifications – CE & FCC Certified, RoHS Compliant
  • Temperature Range – Operating: 0ºC to 55ºC or -20-85°C; Storage: -40ºC to 90ºC
  • Humidity – Operating: 5% to 95%, Storage: Max. 90%

There’s a short discussion thread on 4PDA where they should some boot log, and other information (in Russian).

Most people who read this blog will know about OpenWrt, but I had never heard about Padavan, nor PandoraBox firmware.

The first is an open source project hosted on Bitbucket that aims to “improve the rt-n56u and other supported devices on the software part, allowing power user to take full control over their hardware”. This refers to ASUS RT-N56U router powered by Mediatek MT7621 SoC. The project is actually just called rt-n56u, and Andy Padavan is the developer.

Padavan Web Interface on UniElec U7621-06 – Click to Enlarge

The second is developed by a team of Chinese developer, and support various Mediatek routers. I could not find the source code, but we know it’s based on OpenWrt. You’ll find firmware for over 30 routers and evaluation boards, including PandoraBox-PBR-M1 firmware, that according to screenshots provided on Aliexpress, is the one compatible with UniElec U7621-06.

PandoraBox PBR-M1 Firmware – Click to Enlarge

The router is sold on Aliexpress, with price starting at $41.90 with the board only without WiFi or LTE support, nor enclosure, and up to $124.80 with an MT7615 4×4 802.11ac Wave2 PCIe module, and metal enclosure. Between the two extremes, there are various options for WiFi modules, with or without enclosure. If you need LTE or mSATA, you’d have to source a compatible module separately. The manufacturer’s product page does not have much more information.

Thanks to Danman for the tip

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25 Replies to “UniElec U7621-06 MediaTek MT7621 Router Supports OpenWrt, Padavan, and PandoraBox Firmware”

  1. @cnxsoft: ‘1x PCIE connector for LTE or mSATA module’ is highly misleading (or simply wrong 😉 ) since there is no PCIe here involved. The board features the usual ASM1062 PCIe-to-SATA module and on the mPCIe/mSATA connector only SATA and USB2 are available but NO PCIE.

    Besides that: kernel 3.14.48 built two years ago. On a router device.

  2. For me this seems to be an ideal base for NAS. You have 2xSATA interfaces available and can add more using ASM1062 mpcie modules. And it’s much cheaper than that GNUBee which is basically the same HW.

  3. @danman
    If 16-20 MB/s Samba ‘performance’ defines ‘ideal base for NAS’ for you, why not? Only 256 MB DRAM especially combined with an old smelly kernel will prevent using any modern filesystems/features and if you compare with GNUBee you might realize just later that you have to take care about an enclosure and sufficient powering here too (12V+5V when you’re thinking about 3.5″ HDD).

  4. @cnxsoft
    No idea but… mSATA and mPCIe share the same connector but either SATA or PCIe can be used since data lines are pinmuxed (but optionally two additional USB2 data lines on pins 36/38 are possible though AFAIK only specified for the mPCIe use case). So there’s no clear naming scheme and it’s important to have a closer look what’s routed to the connector. In the above case there’s 2 x PCIe but the 3rd slot is mSATA+USB. It’s important to clarify this since users otherwise think they could insert another mPCIe card (eg. a PCIe SATA controller) which won’t work.

    So for the above device it’s safe to talk about 2 x (m)PCIe, 1 x normal SATA and 1 x mSATA or USB2 (that’s the next problem: many USB LTE modems that use the mPCIe form factor call themselves ‘PCIe modem’ but are just USB thingies).

    And to further add to the confusion: when using Marvell ARMADA SoCs that provide various SERDES lanes the mPCIe/mSATA slots there can change their role by telling u-boot to transport either PCIe or SATA data lines over the respective SERDES lane routed to the port. On such devices you can not even silkscreen either mPCIe or mSATA on the PCB since the switch happens in software.

    So all we could do to decrease confusion is IMO ‘context sensitive’ naming and in this case that means mentioning only mSATA+USB2 (since it can’t be USB3 due to the type-A receptacle the SuperSpeed data lines are routed to). And at least I never found a generic name for this connector, quite the opposite when looking through specifications. I saw PCI-SIG specified even more variants with higher pin count to transport display data too and we can call ourselves lucky that only the 52 pin variant seems to exist in the wild today 🙂

  5. @tkaiser
    The important would be to differentiate between the physical connector, and the interfaces connected to it. For example when we talk about 204-pin SODIMM, and 314-pin MXM connector, there’s no confusion. It’s clear those are just connectors that can be connected to all sorts of signals.

    But in the case of PCIe, it looks like the name can refer to both the connector (PCIe/mPCIe) to which you could connect USB, SATA, GPIO, or whatever, and the actual PCIe interface. So if there was a specific name for the connector itself it would help eliminating the confusion somewhat.

  6. cnxsoft :
    The important would be to differentiate between the physical connector, and the interfaces connected to it.

    I know but how? We could use the term ‘PCI Express Mini Card’ — see https://en.wikipedia.org/wiki/PCI_Express#MINI-CARD — and it still wouldn’t help since it’s important what the connector in question carries. And their description you copied calling the above slot ‘PCIE connector for LTE or mSATA module’ is still just wrong/misleading since nowhere PCIE involved but only SATA and USB2 available on this slot.

    But since we also deal with absolutely careless vendors even if on a board there’s a mPCIe slot providing a PCIe lane it’s still confusing since according to the specs a ‘PCI Express Mini Card’ also requires one pair of USB2 data lines available (eg. for USB WWAN modems that call themselve PCIe modems). Good luck eg. on a BananaPi R2 to use such a ‘PCIe LTE modem’ since SinoVoip ‘forgot’ to route USB2 to the respective pins on the mPCIe connector.

    IMO the only way to deal with this mess is to tell what’s really available.

  7. @tkaiser
    you can see in your linked article: “RAID array has been created and the syncing IO speed is ~86MB/s” and “16MB-20MB@samba” si way too big difference so I guess there will be some problem with configuration. And “I only believe in statistics that I doctored myself” so we will see when it arrives… Check my blog then 😉

  8. @danman
    Yeah, please post your results though I somehow lost my interest in MT7621 in the meantime (wasted already way too much time the last years with crappy vendor ARM kernels and this here seems to be an excercise in wasting time again but this time with MIPS instead of ARM instead — reading through github.com/gnubee-git/GnuBee_Docs/issues/28 was both interesting and discouraging).

    Wrt NAS performance: Yep, quite easy to trash Samba performance on those little gems when inappropriate settings are used. That’s why I mentioned some stuff over in the GNUBee comments section already. Anyway: the Samba performance screenshot from WiTi board came together with a top screenshot showing the smbd process busy with 77%. Unfortunately the client connection has also been established as root so no easy way to check for CPU bottlenecks this way (usually a smbd child process will be forked for every connecting client, no idea if that’s the case too if you establish SMB connections as root since… I would never do that 🙂 ).

  9. @tkaiser


    The physical connector is still mini PCIe, so there’s no other name for it. The problem is that the mSATA standard shares the same physical connector. The full mini PCIe standard calls for:
    PCI Express ×1 (with SMBus)
    USB 2.0
    Wires to diagnostics LEDs for wireless network (i.e., Wi-Fi) status on computer’s chassis
    SIM card for GSM and WCDMA applications (UIM signals on spec.).
    1.5 V and 3.3 V power

    Obviously the SIM card is not available on a lot of devices that has a mini PCIe slot for one and SATA support was a much later add-on that came in various proprietary implementations before it was standardised. One of the original reasons for adding USB was for single card support for Wi-Fi and Bluetooth in notebooks, where the Bluetooth went over USB.

    So yes, the only way to tell what a slot offers, is to write it all out clearly.

    As the SoC in this case only supports three PCIe lanes, they’ve all been used up by the first two mini PCIe slots as well as the SATA controller, so the third slot is clearly just for mSATA drives and USB devices.

  10. cnxsoft :
    What’s the name of this type of this type of connector (when they are not soldered to the board)?

    I’ve seen some motherboard manuals call them “mSATA connectors” in this case. That makes sense after all since you can only connect an mSATA device on them. You don’t really care that they use the same physical connector as a PCIe module if only this one is usable, and it limits confusion. Note, I remember the Armada370-based Mirabox supporting only PCIe and no SATA on this connector… That doesn’t help!

  11. i’m going to need a 4G router very soon, this looks like an interesting cheap board (won’t need an up to date / secure kernel).

    but i’ve been looking for 4G mpcie cards and my first searches will only source quite expensive parts 40-90e, am i missing something ?

    Are there cheap 4G router alternative available ?

  12. Is it supported (developed) by padavan personally or just based on his repository of source code? This is a huge difference

  13. I have this board.
    Is download link for PandoraBox firmware down or moved to somewhere else? downloads.pandorabox.com.cn/pandorabox/PandoraBox-PBR-M1/

  14. Hello

    I got one of these boards and applied a ‘sysupgrade -n -F’ by ssh (, user: root/passwd: admin), using this file:


    System shows after boot (dmesg):

    Linux version 4.9.76 (buildbot@builds) (gcc version 5.5.0 (OpenWrt GCC 5.5.0 r5678-0b28cc5) ) #0 SMP Sat Jan 13 07:00:14 2018

    I’ll do some tests and report later. Hardware build quality looks nice and shipping is fast.

  15. Pandorabox is a dead project. Repo links are dead.

    Openwrt build for this router is development build and have annoying bugs.

    Padavan is completely another story. It’s not like openwrt. You cannot install packages.

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