Mobvoi Ticwatch E3 (mobvoi-ricefish)
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| This device has been tested with postmarketOS, but its device package has not yet been added to the postmarketOS repositories. This means that it cannot be selected in pmbootstrap. | 
|  | |
| Manufacturer | Mobvoi | 
|---|---|
| Name | TicWatch E3 | 
| Codename | mobvoi-ricefish | 
| Released | 2021 | 
| Type | watch | 
| Hardware | |
| Chipset | Qualcomm Snapdragon Wear 4100 (SDM429w) | 
| CPU | 4x 1.70 GHz Cortex-A53 | 
| GPU | Adreno 504 | 
| Display | 360x360 | 
| Storage | 8 GB | 
| Memory | 1 GB | 
| Architecture | aarch64 | 
| Software | |
| Original software The software and version the device was shipped with. | Wear OS H-MR2 | 
| Extended version The most recent supported version from the manufacturer. | Wear OS | 
| Mainline Instead of a Linux kernel fork, it is possible to run (Close to) Mainline. | no | 
| Flashing Whether it is possible to flash the device with  pmbootstrap flasher. | Untested | 
|---|---|
| USB Networking After connecting the device with USB to your PC, you can connect to it via telnet (initramfs) or SSH (booted system). | Untested | 
| Battery Whether charging and battery level reporting work. | Untested | 
| Screen Whether the display works; ideally with sleep mode and brightness control. | Untested | 
| Touchscreen | Untested | 
| Multimedia | |
| 3D Acceleration | Untested | 
| Audio Audio playback, microphone, headset and buttons. | Untested | 
| Camera | Untested | 
| Connectivity | |
| WiFi | Untested | 
| Bluetooth | Untested | 
| GPS | Untested | 
| Modem | |
| Calls | Untested | 
| SMS | Untested | 
| Mobile data | Untested | 
| Miscellaneous | |
| FDE Full disk encryption and unlocking with unl0kr. | Untested | 
| USB OTG USB On-The-Go or USB-C Role switching. | Untested | 
| Sensors | |
| Accelerometer Handles automatic screen rotation in many interfaces. | Untested | 
Maintainer(s)
Users owning this device
ADB and Fastboot Over USB
While a bluetooth connection can be used for ADB debugging while booted into Android, a wired connection is necessary for doing anything in Fastboot. Unlike some Wear OS smartwatches, the TicWatch E3 has a 4-pin connection on the back, which can be used for a USB connection. However, the included charging cable only has 2 pins, which do not carry data.
Some people have found that the old charger from the TicWatch Pro 4G (which had 4 pins and allowed data transfer) can be modified to fit the TicWatch Pro 3. The TicWatch Pro 3 and E3 should be similar enough that this method will still work. See this Reddit comment from someone that got it to work.
TODO: try modding a USB cable for this and report back.