Bootloader of MSM8909 + Android5.1.1 --- download failure caused by modifying UART0 clock frequency

Bootloader of MSM8909 + Android5.1.1 --- download failure caused by modifying UART0 clock frequency

Bootloader of MSM8909 + Android5.1.1 --- solve the problem of downloading failure caused by modifying the UART0 clock frequency

 

Use Qualcomm's QFIL to download the program. The normal download interface is displayed as follows:

 

Figure 1

QDLoader is displayed, indicating the download mode. After I accidentally modified the downloading frequency of the corresponding serial port BLSP1 UART0, the system always prompts that the download failed, and the above shows that it is not QDLoader, what have you forgotten. It should be because the QFIL interface fails to interact with the serial port and cannot enter the download mode.

 

You can download the file in forced download mode by following these steps:

1. Get a USB cable (small first segment) D + and connect to the ground, and insert the USB to the core board. Press the power-on key (normal boot time) to enter 9008.

2. Long press the on/off key, volume up/down key for 10-15 s

3. Do not connect to the battery. Use the 2 points in the tweezers short answer figure to insert the USB cable to the PC port. Wait until Port 9008 is found and remove the tweezers and add the battery.

 

Figure 2

This figure shows the core board of Shanghai ximtong.