-rw-r-----. 1 bcat bcat 1022524 Feb 24 07:40 adsl_phy.bin
[Duo2 Downloads]$ strings -5 *.bin | grep ^BBH!'qBH$5CB&fCh$B.Eu1Broadcom DSL Version A2pv6F039vBuilt on 02/02/2016 15:11:32BroadcomBroadcom CorpBroadcom DSL[Duo2 Downloads]$
A quick google gives this http://www.hwupgrade.it/forum/showthread.php?p=43621753
first firmware (EU) for VR2600 and D50http://www.tp-link.it/res/down/soft/..._V1_160330.zip(Dsl bcm63168 A2pv6F039v.d25a)http://www.tp-link.it/res/down/soft/..._V1_151229.zip(Dsl bcm6318, firmware ADSL2 + always A2pG039f2 version)
Thanks to a member of this forum I am now running A2pv6F039q.d24m on my billion.