Thanks for SPI Flash config. It works also for my version of card. My fimrware version was 00013400, so very old.
I was able to flash it from Windows XP running as VirtualBox guest (see https://docs.oracle.com/cd/E97728_01...ssthrough.html).
Before starting machine you have to attach PCI device
Code:
VBoxManage modifyvm "VM name" --pciattach 04:00.0@01:05.0
Where 04:00 is bus number returned by lspci

To detach PCI device:
Code:
VBoxManage modifyvm "VM name" --pcidetach 04:00.0