- connect it to programmer supported by flashrom 
- download flashrom source code 
- extract, apply patch , compile
- download flash content, or download dump from my github repository 
./flashrom --programmer serprog:dev=/dev/ttyUSB0 --read BK8000L.flash
edit with favorite hex editor:
search for asci string BK8000L, change it, save and flash:
./flashrom --programmer serprog:dev=/dev/ttyUSB0 --read BK8000L.flashflashrom v0.9.9-r1955 on Linux 4.4.10-040410-generic (x86_64)
flashrom is free software, get the source code at https://flashrom.org
Calibrating delay loop... OK.
serprog: Programmer name is "frser-duino"
serprog: requested mapping AT45CS1282 is incompatible: 0x1080000 bytes at 0x00000000fef80000.
Found FMD flash chip "FT25H04" (512 kB, SPI) on serprog.
This flash part has status UNTESTED for operations: PROBE READ ERASE WRITE
The test status of this chip may have been updated in the latest development
version of flashrom. If you are running the latest development version,
please email a report to email@example.com if any of the above operations
work correctly for you with this flash chip. Please include the flashrom log
file for all operations you tested (see the man page for details), and mention
which mainboard or programmer you tested in the subject line.
Thanks for your help!
Reading old flash chip contents... done.
Erasing and writing flash chip... Erase/write done.
Verifying flash... VERIFIED.
solder flashchip back on module, power it and enjoy ;)