Have the same problems
Running Flirc GUI version 3.20.4 on Linux 64bit (Mint 19) first generation of Flirc.
trying upgrade (File->Advanced->Force FW Upgrade) it says that my current FW version is 3.9.0 and that the latest firmware version is 3.9.00
The log says ERROR. Firmware upgrade required. (fw >= 4.1.0.)
How to upgrade to 4.1.0 first ??
flirc_util settings gives this
myname@system:~$ flirc_util settings
flirc_util version 3.20.4 [3.20.4]
Firmware Detected
Version: v3.9.0
SKU: flirc
Hash: 0xE31E4C1A
Settings:
sleep detection: Enabled
noise canceler: Disabled
inter-key delay: 5
seq. modifiers: Disabled
[E] lib/libflirc/bootloader/bl_2.0.c fl_ver2_product_type(526): unknown or unsupported variant: 144
variant: Unknown
builtin profiles: Enable
Memory Info:
keys recorded: 0
keys remaining: 169
memory used: 0%
product sku: flirc
No Keys Found