Maybe you have the 238FOUR, not the 238ONE? Your board has an extra socket top-right, maybe ADSL?
Compare it to my hardware list - you didn't list the memory chip.
MXIC T151 MX30LF1G08AA = 1gbit NAND
Any firmware will likely only have 'half' of the wifi working. But 2.4GHz band is busy anyway. PSTN is known not working unless someone wants to figure out DECT, and... DSL, well, get fibre 
@olek210 Do you have a DTS still?
Look for the dwr966 branch on my github account. This router has the same chipset.
mine is dead