Did GF nerf upgrade success rate??

No its Normal that Weapon you try to upgrade can only go up to 4 thats the reason why you can already Fail by the first Upgrades

just forget that weapon and get a normal unique one... Xd

extra 5%xp at below lv 10 doesnt really speed up the much of the leveling process

isn't that upgrade item is unbreakable up to +4? It's a fact

Edit: sorry i thought your weapon broke at +2, it was a mistake

Seems those weapons we get from those boxes (5 15 25 35 ..) have different mechanics when it comes to upgrading. To my knowledge or expierence... a normal item has +9 max upgrade, the stuff we get from boxes have max +4, so it seems they do have different upgrading.

I did fail +2, 3 times in a row and 2 times (different characters)

Actually I never saw an item failing to upgrade on +1 to +2

What are the odds? I mean I had loooots of attemps, but never saw it