There's so much wrong with this entire thing... First of all, you simply DO NOT use youtube for this kind of things, since there's so much newbs posing as experts using outdated methods that are usually dangerous. Unless, of course, the channel is reputable (such as MrMario2011)
I don't have HEN icon. when i want to update my ps3 from cfw 4.84 ferrox to last version i downloaded HFW 4.86.1 LITE rebug 2 months ago
hfw is hybrid firmware, NOT custom firmware. you have CUSTOM firmware (cfw) installed, not hybrid firmware.
and now when i want to play ps2 game i don't see all tools in rebug toolbox selector section, and saw some video in youtube and then i now that the version is lite and not like full version and i can't downgrade or play ps2 game. so i just whant to now if this is right or not. Thank you
You don't need anything on rebug toolbox to enable ps2 games capability. you just need to have cobra enabled, which should be enabled by default. You might also not have the latest version of the rebug toolbox installed, to install it go to package manager, install, system storage, it should be there since it's included with the firmware.
Once you confirm cobra is enabled, place your PS2 isos on dev_hdd0/PS2ISO (they can only be played from internal hdd), mount them with your preferred backup manager (irisman, multiman, webman mod, managunz) and play from the disc icon on XMB. That's it. No need to downgrade.