You can earn 266,and even more high power equipments in the tower.  If you have cleared 1 boss floor in the tower, and the game crashes suddenly. Then you will climb the Tower again, but the counter of the boss being killed will be 1.  Every time you get an additional BOSS kill, your rewards increased by 3 levels.

In fact,players can only get 263 power weapons when they compeleted the tower and no suddenly game crash.

The screenshots below are using simplified chinese language