Firmware:
Online video tutorials. URL: https://youtu.be/tIoer2xH8zU
Online video tutorials. URL: https://youtu.be/kfj9WcEugcc
netbox_update_package_20180124
ps2usb_update_package_20180124
PS2USB2.0_update_package_20180119
Manual:
PS1 VCD :
Classic_PS1_and_FC_Classical_232in1.VCD 53.6 MB
PS1 Raiden Project (J).VCD 13 MB
PS1 Raiden Project (J)_COV.VCD 34 KB 
PS1_FC_GamesCollection.rar 74 MB
PS1_Arcade_Games_Collection.rar 387 MB
PS2 APP :
ULE442.ELF 442 KB
BootFromDVD.ELF 49 KB
OPL Themes :
OPL_Themes.rar 5 MB
TOOLs :
FMCB1.93 5 MB
CUE2POPS_v2.3.rar 32 KB
Empty_directory_structure_for_PS2netbox_PS2USB2.0.rar 1 KB
PS2_CD2DVD.rar 1 MB
720_-130814-FMCBIns-1.93__(Unofficial Free Memory Card Boot FMCB v1.8C installer v0.94D) 4.7MB
For those who downloaded the new firmware, it is worth leaving a few words here.