Known issues¶
This page lists known issues for the Birch shipment of phones as supplied to users.
Data¶
Inability to write to microSD card¶
Problem: Any installed microSD card can only be read from and not written to.
Description: This is a limitation of the Birch hardware.
Unable to receive a fixed GNSS location¶
Problem: The GNSS module is unable to reliably receive broadcasts from satellites, making it difficult to fix the location of the phone.
Description: This problem will be addressed in later revisions of the hardware, from Dogwood onwards.
Power¶
Rapid charging failure¶
Problem: When charging the phone using a charger, 12V negotiation and rapid charging can fail.
Description: If this failure occurs, USB 2.0 data transmission can also be affected. This failure mode does not affect 5V charging over a USB type-C to USB type-A cable.
Solution: To help prevent this, follow these step to charge the phone:
Unplug the power adapter (wall wart) from the power outlet.
Plug one end of the USB-cable into the adapter and the other end into the phone.
Plug the adapter into the power outlet.
When unplugging:
Unplug the adapter from the power outlet first.
Unplug the USB-C cable from the phone.
Difficulty powering on the device¶
Problem: After being powered down, the phone can be difficult to power up again.
Description: This problem is related to a software issue which was fixed after the phones were shipped: Power Button Not Turning Device Back On
Solution: The solution for a phone with the original software is to unplug the USB cable, then press the power button for 15-18 seconds.
Call audio routing not working¶
Problem: Call audio routing is not functioning completely.
Description: This issue will be fixed in an upcoming system update.
Incorrectly labeled battery capacity¶
Problem: The battery installed in the phone is labelled with a capacity of 2000 mAh.
Description: This is a conservative estimate of the capacity. Later iterations of the phone should have higher capacity batteries.
Power/heat issues¶
Problem: Power management and heat issues are caused by various subsystems.
Description: The processor will be run more slowly to prevent overheating, affecting processing performance.
Device reboots when turning on the modem HKS¶
Description: The phone may sometimes restart when turning the modem on using the kill switch.
Description: This depends on the modem in use. BroadMobi BM818-A1/E1 modems do not seem to be affected.
Device reboots if SIM inserted/removed while powered on¶
Problem: The phone may restart if you remove or insert the SIM card while it is powered.
Description: This is due to the type of SIM tray in use. Users should power off the phone before replacing SIM cards.
Inconsistencies with rapid charging¶
Problem: Activation of rapid charging depends on whether the TPS65982 power controller is first powered via USB or via the battery.
Rapid charging not working with certain USB cables¶
Problem: Rapid charging is currently not possible over a USB A to C cable.
Description: This is due to a software issue. (See BQ25895: Disable BC1.2 and Set IINLIM to Max Value).