I found this device. It's in pre-sail for 50USD.
Inside there are:
CPU1: MediaTek MT7621A (880 MHz, 2 cores)
FLA1: 128 MiB
RAM1: 256 MiB
USB ports: 1 (3.0)
WI1 chip1: MediaTek MT7603EN (2x2:2)
WI2 chip1: MediaTek MT7612EN (2x2:2)
LAN: 2x 10/100/1000
WAN: 1x10/100/1000
Bootloader U-Boot
Source: https://wikidevi.com/wiki/Xiaomi_MiWiFi_3G
I believe it's a new device. The price compered to the spec is (In my opinion) great. What do you think guys? Will it get some love from LEDE?
Installation instructions provided by @dissent1:
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Unbox router
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Connect to the router using WiFi
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Goto http://192.168.31.1
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Go through the wizard to set passwords for the router + wifi
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Reconnect to the router using WiFi
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Goto http://192.168.31.1
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Logon and find the page where you can upgrade the firmware look for a big yellow dot with an “i” inside. You will see the version number of the router and there is a button below where you can browse for a file.
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Flash miwifi_r3g_firmware_c2175_2.25.122.bin (developer firmware) and wait a few minutes.
Download https://play.google.com/store/apps/details?id=com.xiaomi.router to your phone/tablet (there is also an iOS app) -
Open “Mi Wi-Fi” app (and sign-up) and sign-in to your account. Router will be detected and added to your account (assuming you are connected to the WiFi on the router and the routers WAN port is connected to Internet).
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On a PC, visit https://d.miwifi.com/rom/ssh and sign-in to you account. You will get to a page that should display your router, the root password and a download button. Hit the button to get miwifi_ssh.bin
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Format USB drive using FAT32 and copy miwifi_ssh.bin, lede-ramips-mt7621-mir3g-squashfs-kernel1.bin and lede-ramips-mt7621-mir3g-squashfs-rootfs0.bin to the USB drive
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Cut the power the router, put the USB drive in the router, press and hold “reset” button (with a paper-clip), power on the router (while holding reset). When the router starts flashing yellow release the reset button. Wait until router has rebooted and you should (finally…) have SSH access.
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Login to the router using SSH using the “root” as username and the (root) “password” from https://d.miwifi.com/rom/ssh
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In SSH console
cd /extdisks/sda1 (can be different if you remove and reinsert the usb stick)
mtd write lede-ramips-mt7621-mir3g-squashfs-kernel1.bin kernel1
mtd write lede-ramips-mt7621-mir3g-squashfs-rootfs0.bin rootfs0
nvram set flag_try_sys1_failed=1
nvram commit
reboot
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LEDE should be installed and available at 192.168.1.1 (with WiFi disabled I assume)
Upgrading to a newer snapshot can be done using the regular methods (from the command-line using sysupgrade or through LuCI) using lede-ramips-mt7621-mir3g-squashfs-sysupgrade.tar
Known Issues:
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Some users are reporting having troubles with connecting to the 2.4 Ghz network related to this entry in the syslog:
daemon.notice hostapd: wlan0: STA XX:XX:XX:XX:XX:XX IEEE 802.11: did not acknowledge authentication response