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The Gemtek WVRTM-127ACN is an indoor dual band wifi router with internal antennas and 3 Gigabit Ethernet ports. The Gemtek WVRTM-130ACN is an indoor dual band wifi router with external antennas and 5 Gigabit Ethernet ports. Hardware of WVRTM-127ACN: - SoC: Mediatek MT7621AT (880 MHz, dual core) - RAM: 128 MB - Storage: 128 MB NAND SLC flash - Ethernet: 3x 10/100/1000 Mbps LAN1,LAN2 & WAN - Wireless: 2.4GHz: Mediatek MT7603EN (802.11b/g/n) - Wireless: 5GHz: Mediatek MT7612EN (802.11n/ac) - LEDs: 11x - Buttons: 2x WPS, reset - USB: 1x 3.0 - Power: 56 VDC, 0.54 A, PoE+ IN (WAN) - PoE: 1x PoE+ 802.3af/at (WAN) - Uart: GND RX TX VCC - J2 (GND near WAN) - Board silkscreen: "WVRTM-127ACN_V02" "19K-513-8500R" "RoHS" "1717" Hardware of WVRTM-130ACN: - SoC: Mediatek MT7621AT (880 MHz, dual core) - RAM: 128 MB (Kioxia TC58BVG0S3HTA00) - Storage: 128 MB NAND SLC (Winbond W971GG6SB-25) - Ethernet: 5x 10/100/1000 Mbps LAN1,LAN2,LAN3,LAN4 & WAN - Wireless: 2.4GHz and 5GHz Mediatek MT7615DN (802.11ac/b/g/n) (DBDC) - LEDs: 10x - Buttons: 3x Power, WPS, reset - USB: 1x 3.0 - Power: 56 VDC, 0.54 A, PoE+ (WAN) - PoE: 1x PoE+ 802.3af/at (WAN) - Uart: GND RX TX VCC - J2 (GND near WAN) - Board silkscreen: "WVRTM-130ACN_V01" "19K-515-4500R" "RoHS" "2112" Enable access to uboot menu (needed in wvrtm-130acn): - The access to uboot menu is blocked by `bootdelay = 0` set in ubootenv. With stock firmware version 01.01.02.163 and previous, you can use CVE 2020-24365 command injection https://nvd.nist.gov/vuln/detail/CVE-2020-24365 python3 exploit.py -t 192.168.1.1 -c "fw_setenv bootdelay 3; fw_saveenv" Backup the stock firmware: - Connect via uart - Connect via ethernet and assign your pc the address 192.168.15.x/24 - Power on the device; and start typing '4' to enter uboot menu - Set factory mode and boot MT7621 # setenv factory 2; saveenv MT7621 # nand read 2800000 2000000 81000000; bootm - Telnet and copy all mtd blocks telnet 192.168.15.1 - Copy all mtd blocks and start webserver for N in $(seq 0 6); do dd if=/dev/mtd$N of=/tmp/eeprom_mtd$N.bin; done mount -o bind /tmp /www lighttpd -f /etc/lighttpd.conf - Backup stock rootfs_data (optional) dd if=/dev/mtd7 of=/tmp/eeprom_mtd7.bin dd if=/dev/mtd8 of=/tmp/eeprom_mtd8.bin - Download to your pc from http://192.168.15.1/eeprom_mtd$N.bin Installation: - Connect via uart - Connect via ethernet and assign your pc the address 10.10.10.3/24 - Start a tftp server and serve the image initramfs-kernel.bin mkdir /tmp/ftpd; cp initramfs-kernel.bin /tmp/ftpd/kernel.bin dnsmasq --enable-tftp --tftp-root=/tmp/ftpd - Power on the device; and start typing '4' to halt the bootloader - Change the active mtd partition from mtd6 to mtd5 (needed by uboot) MT7621 # setenv mtddevnum 5; saveenv - Write the openwrt initramfs in ram via tftp and boot it MT7621 # tftpboot 81000000 kernel.bin; bootm - From the initramfs create the ubi device and install openwrt via sysupgrade ubiformat /dev/mtd11 -y sysupgrade -n -v /tmp/sysupgrade.bin Recovery: Restore the stock firmware from the backup of the mtd blocks mtd write eeprom_mtd5.bin firmware mtd write eeprom_mtd6.bin Kernel2 mtd write eeprom_mtd7.bin Storage1 mtd write eeprom_mtd8.bin Storage2 ubiformat /dev/mtd8 -y reboot Links to previous works on wvrtm-127acn: https://github.com/digiampietro/hacking-gemtek https://forum.openwrt.org/t/add-support-for-gemtek-wvrtm-127acn-linkem-provider/168757 Signed-off-by: Samuele Longhi <agave@dracaena.it> Link: https://github.com/openwrt/openwrt/pull/16685 Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de> |
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