[Update #5 is here!]

e13ectronic, you can reset items on configure screen (wrench button), just click "Respec" and check if cost is appropriate to you. This will reset all item upgrades and unattach mods. Pro status of item remains untouched.

Oh god, me lame ( ty bro. about items reset question closed.

but about the reset acc question still actual i think. all came to this universe of tenno-ninjas with 0 knowledge, about what better to choose...

[Update #5 is here!]

Hi, can you do a "reset button"?) i try to explain... I wanna try all classes of warframes (first 4), to choose with i like most. For now i need to create few acc, or spend platinum for this purpose. That it is not very cool, because I want simply to just try them... Or i choose wrong branch of items build tree, other would be better. but i can realize it only use items and do few upgraids(spend points)... And i can`t do nothing with that, its so sad( i think there shood be "button of reset", which reset curent item. it can reset skill build, or reset item to lvl 0. it can cost some thing, or be free. it depend on you) but the button MUST BE!!! And reset acc, witch will give you all platinum you spend back, and all items lvl 0. but items you obtain in loot must stay(bluespirits, and mods).

ps sorry for my broken english