The dev will lie if they answer so if you want a honest answer,they have set the gear stats to be bad because they use gears an stamina as a way to slow the players down in progression ,so in 99.9 times you upgrade a gear the sub stats that always goes up the most is effect resistance,flat hp, flat attack, flat defense,effectiveness ,hp percent, defense percent!!!  The other stats have a low chance to upgrade an if they do they never go full stats upgrade rarely you will get a gear go full attack percent,full spd sub, full crit sub, or full crit damage sub.

If you also notice, the good gear they put on sale from the arena shop and obtainable from story exchange shop have a very little impact to increase, PLUS! they always tend to increase to dogshit stat like effect resistance, health or defense while you are having offensive stat item. I believe they want all player to cripple and having such abyssmal progress and no fun is allowed even you trying so hard just to obtain one fine piece of equipment. A bit of randomizer is ok but at this rate, i believe we all been through such hell and the game does not even reward us accordingly. 

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It's funny when people don't have exact base information but claiming it either way. It's like they are an oracle or some sort.

From all of my equipment upgrade, they just randomly upgrade into the subs. Some got into desired ones, and some got into the undesired ones. So, I firmly believe it is RNG.

If you are thinking of "Oh, I want all of the upgrade goes into 1 specific substats", this is very unlikely due to the chance to get into 1 stats for 5 times consecutively.

Let's say each subs have 25% chance to get upgraded, 5 times it means 0.25 x 0.25 x 0.25 x 0.25 x 0.25 = 0.00097 ~  0.001

That's even less chance than getting ML 5* in normal summon. You must be extremely lucky to even do that.

Also not everytime you upgrade equipment will goes into bad stats, you just have to make sure your equip should have less bad substat before enhancing them. If possible make it 3 good subs & 1 bad subs, so you have 75% to get good result.

Hi all,

Thank you for responding.  Really appreciate it.

I just want to commend on @Vixx‘s comment.  thanks man!  As expected,  i just thought that upgrading blue gears give low rolls.  It’s just quite frustrating but your  response do make sense.  

I understand that all of us are wanting to get proper gears, but I realized that we can’t really get both of best worlds. I guess, I should just compromise to balance my bad luck and RNG by getting satisfactory sub stats prior to upgrading.

Sometimes I feel very unlucky and not a single roll went into speed sub, so I calculated the chance of rolling 5 times NOT in the sub you wanted. 0.75^5 = 23.7% see very high chance of that happening

It's not rng it is system set to go into all bad rolls such as flat stats an effectiveness an effect resistance,sure vixx can show gears that looks good I have plenty an sure blue gears can give good rolls I have plenty, but if it was easy to get gears that roll good an roll right all the time I would have all units geared,the system isn't balance to get all stats rolled some stats are set higher so you don't progress fast.

Don't roll on gear with bad substats, problem solved. If it has effect resist, don't roll on it. If it has undesired flat stats, don't roll. Use the gear as fodder to convert to another epic gear with desired substats. Do not use any of arena gear as Fodder.