Youmile USB Programmer Series Burner Chip 24 EEPROM BIOS Writer 25 SPI Flash + Sop8 Test Clip

Product Information

On many systems, the VCC pin of the SPI flash is shared with other chips on the system, causing them to be powered through the voltage supplied through your programming clip. In this case, parts of the chipset may power up, and it may attempt to set the SPI lines high or low, interfering with the data the Pi is trying to send. If the Pi and chipset are trying to set a pin to different values, the side with a greater drive strength will be able to “pull” the voltage toward the level it wants to set. If it says “VERIFIED” or says that the chip contents are identical to the requested image, then the chip is properly flashed.

NOTE: On some systems, higher speeds will be unstable. On those systems, try lower speed like spispeed=4096 or even spispeed=2048 which should, in most cases, work just fine but it will obviously be slower. The spispeed=32768 setting works just fine on most setups if you use short wires, within 10cm. CH341EVT.ZIP - some source code and tools written to be used with an evaluation board (may be useful for programming software that can access this device)ISP means in-system programming. It’s when you flash a chip that is already mounted to the mainboard of your computer that you wish to install libreboot on. Do not disconnect your chip from the flasher until you’ve disconnected or turned off the power source. It has everything you need, from the Programmer itself, a 1.8v adapter (for AMD AM4 motherboards - more on that later), the SOIC8 Test Clip, and a bunch of other parts you might find useful later. By reading the datasheet, we can see that the manufacturer recommended to connect a 0.47 uF capacitor between RSTI (pin 2) and VCC for improved stability. There is none on this board. Install CH341A Programmer Software v1.31 and CH 341A drivers. Run the programm, now there are no 95xxx type of eeproms available in the software, select 25xxx, with same capacity as your chip. And thats it.

I did get it to work last night, although not using the CH341A programmer. Because of my weird arrangement, I wondered if it could be an issue due to noise on the SPI bus. I wondered if I could fix this by playing with the SPI speed. As the CH341A can't do that, I got my raspberry pi up, which has native SPI and flashrom support, and used flashrom to play around with the speeds. After a lot of trial and error, I got multiple good, verified reads and proceeded to modify the bin file, successfully upload and verify the flash chip, resolder the chip, and boot the device. Fortunately, the drive strength of the Raspberry Pi can be increased up to 16mA. There are a few tools that can set this, such as the pigs utility from the pigpio project. On the Raspberry Pi OS, the following commands should install pigpio and set the drive strength to 16mA: A good choice of soldering iron would be a T12-D08 or T12-K tip, on a T12 soldering station. KSGER makes nice soldering stations: If your computer restarts constantly, after trying to flash the Bios via M-Flash and no standard solution worked: reset the CMOS, unplug the hard drives, change the location of the memory modules, remove the motherboard battery, try to access Dos through a bootable USB key to reinstall the Bios, then you just have to reprogram the Bios with an external integrated circuit. Hardware full duplex UART interface, integrated transmit-receive buffer, supports communication baud rate varies from 50bps to 2Mbps.

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