Does anyone know how to fix this. Most of the time when i try to load a .jar fil on my phone it gets to the end and then fails. Anyone know what the problem is?

rarely able to directly install the jar to the bb, the most stable and safe installation method is to install the cod / alx

When i try to use the jar to alx converter that doesn't work either.

Try to hard reset your blackberry first then.

Try download diferent .jar file...

just extract the jar file and you will get a cod and alx file sometimes they even get extracted into there own folders i know because i download games from bbsgame.mobi and they come in a file text or form saying file well press or right click and press rename then put .jar at the end and press ok to change even if it states that it wont work after u do so its bull believe me then when its changed into a jar files right click and choose extract here and ur folder will appear with the cod and alx files in them then u open blackberry desktop manager and open apps loader and you know the rest peace outyour very welcome god bless peace be with you lmaona but im serious this is the way to mess with jar files see ya