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inbox:toh:xiaomi:mi_wifi_range_extender_ac1200_model_ra75 [2023/01/18 10:42] – [Debricking] jdeisenhinbox:toh:xiaomi:mi_wifi_range_extender_ac1200_model_ra75 [2024/05/01 20:03] – [Debricking] jdeisenh
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 ====== Xiaomi Mi WiFi Range Extender AC1200 Model RA75 ====== ====== Xiaomi Mi WiFi Range Extender AC1200 Model RA75 ======
 +
 +{{:media:xiaomi:xiaomi-mi-wifi-range-extender-ac1200_small.jpg?200|RA75}}
  
 This is a compact, wall-wart type range extender with 2x2 Wifi5 dual band hardware. 20€ in 2022 in Germany, taxes included.  This is a compact, wall-wart type range extender with 2x2 Wifi5 dual band hardware. 20€ in 2022 in Germany, taxes included. 
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 Major hardware limitations (if you don't count the form factor's inherent lack of interfaces) are the 100Mbit LAN port and the 64MB of RAM.  Major hardware limitations (if you don't count the form factor's inherent lack of interfaces) are the 100Mbit LAN port and the 64MB of RAM. 
  
-{{:media:xiaomi:xiaomi-mi-wifi-range-extender-ac1200_small.jpg|RA75}}+WarningThere is a newer version on the market, Model RC04. This looks identical, but is quite a bit harder to install. Avoid
  
-===== OpenWrt support =====+===== Supported Versions ===== 
 +<!-- ToH: { 
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 +} -->
  
 Supported in snapshots, since 2023-01-14.  Supported in snapshots, since 2023-01-14. 
 +
  
 This box does not run a HTML UI, it is configured through an app. For this reason, you cannot use OpenWrtInvasion. This box does not run a HTML UI, it is configured through an app. For this reason, you cannot use OpenWrtInvasion.
 You have to install it by opening the box, soldering an UART connector, connect an UART 3V Interface, flash via shell and TFTP.  You have to install it by opening the box, soldering an UART connector, connect an UART 3V Interface, flash via shell and TFTP. 
  
-This is almost the same hardware as [[:toh:xiaomi:mi_router_4a_mir4a_100m]] and can run its firmware, see notes at 'Experimental Firmware'.+This is almost the same hardware as [[:toh:xiaomi:mi_router_4a_mir4a_100m]] and can run its firmware, see notes at 'Alternative Firmware'.
  
 Please note that right now, there is no way back to the stock firmware. (For lack of trying, and why would anybody?) Please note that right now, there is no way back to the stock firmware. (For lack of trying, and why would anybody?)
-===== Supporting activities =====+ 
 +There seems to be a new version available from 2023 'Model RC04' with a different wifi chip. This is almost identical, but has a newer 5GHz Wifi chip. Unfortunately, console is not functional without directly modifying the SPI Flash's content with a flash programmer. You will also need to load a different chipset driver to get 5GHz functional.  
 + 
 +** Supporting activities **
  
 OpenWrt forum thread: https://forum.openwrt.org/t/almost-supported-xiaomi-ra75-aka-miwifi-range-extender-ac1200/134855 OpenWrt forum thread: https://forum.openwrt.org/t/almost-supported-xiaomi-ra75-aka-miwifi-range-extender-ac1200/134855
  
-===== Experimental firmware ===== +===== Hardware Highlights ===== 
-Since there is currenlty a build problem for the targeta built of r21847-4a444e576f +<!-- ToH: { 
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-https://drive.google.com/file/d/1N4-yeFg8L_bQWzBc04WEkwcrpc-0NnXa/view?usp=sharing+===== Installation ===== 
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 +** Alternative firmware ** 
 + 
 +If you must or want to run a pre-2022 release version, you can use the one for mi-router-4a-100m 
 +Warning: (*not* mi-router-4a-100m-intl). 
  
-It is also possible to run the release firmware of mi-router-4a-100m (*not* mi-router-4a-100m-intl).  
 Buttons and LED definitions are wrong, and the LAN interface does not exist, the only ethernet is the WAN interface).  Buttons and LED definitions are wrong, and the LAN interface does not exist, the only ethernet is the WAN interface). 
 It follows that you have to disable the firewall or adjust the network config from the serial console, otherwise the device will be inacessible.  It follows that you have to disable the firewall or adjust the network config from the serial console, otherwise the device will be inacessible. 
  
- 
- 
-===== Hardware highlights ===== 
-^ CPU                  ^ Ram      ^ Flash    ^ Network  ^ WLAN                     ^ USB  ^ Serial  ^ JTag  ^ 
-| MT7628DAN @ 580 MHz  |  64 MiB  |  16 MiB  |  1x 100  |  b/g/n/ac 2x2 Dual band  |  no  |  Yes    |  ?    | 
- 
- 
- 
-===== Installation ===== 
-/* 
-  - → [[:downloads|Obtain firmware]] 
-  - → [[docs:guide-user:installation:generic.flashing|Install OpenWrt]] 
-  - → [[:downloads|Latest OpenWrt release]] 
-*/ 
 ==== Installing OpenWrt ==== ==== Installing OpenWrt ====
 Only known way to install *right now* is the old school way of opening the box, soldering in a UART header, connecting to console.  Only known way to install *right now* is the old school way of opening the box, soldering in a UART header, connecting to console. 
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 -> [[docs:guide-user:troubleshooting:generic.debrick]] -> [[docs:guide-user:troubleshooting:generic.debrick]]
  
-As long as you haven't shot your bootloader, the serial console install should work. +The standard method of debricking common to xiaomi devices work: Hold the reset button while booting to get into a mode where the device will request a signed bootloader via TFTP. But there is currently no known source for an installable stock firmware 
  
  
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 There is a single screw under the barcode label, right side. Removing the screw beneath, you can split the unit into the power supply and the wifi part. The 'hot' parts are shielded, no risk of electrical shock.  There is a single screw under the barcode label, right side. Removing the screw beneath, you can split the unit into the power supply and the wifi part. The 'hot' parts are shielded, no risk of electrical shock. 
  
 +{{:media:xiaomi:ra75_open.jpg|RA75}}
 ==== Serial ==== ==== Serial ====
 -> [[docs:techref:hardware:port.serial]] general information about the serial port, serial port cable, etc. -> [[docs:techref:hardware:port.serial]] general information about the serial port, serial port cable, etc.
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 ===== Tags ===== ===== Tags =====
-{{tag>MIPS ramips Mediatek mt7628an wlan 802.11abgn 802.11a 802.11bgn 802.11ac fastethernet wall_plug 1button mains_powered 16Flash 64RAM Serial U-Boot}}+{{tag>MIPS ramips mt7628an 16Flash 64RAM 1port fastethernet wlan 802.11abgn 802.11a 802.11bgn 802.11ac wall_plug 1button mains_powered Serial U-Boot}}
  • Last modified: 2024/11/05 17:55
  • by griba