what VICE version are you using?
what operating system are you using?
what did you do?
I tried the game "Legend of Blacksilver" (Version: Test2) for Easyflash (https://sites.google.com/site/saxxonpike/LegendOfBlacksilver-Test2.zip?attredirects=0) on real hardware.
what did happen?
It does not boot on a real Easyflash hardware, but in Vice everything works fine!
what did you expect to happen?
The program should not boot in VICE.
what is the problem?
The xbank-format (cart id:33) stores the starting bank in $DF00.
Some people believe (yes, that's a bad idea), it's the same way for the easyflash-format (cart id:32) and start their programm with:
LDX $DF00 INX STX $DE00 ; Set Bank
Vice initializes $df00 always with 0. After the INX-command the X-register is always 1. So it starts always with bank 1. On real hardware (cart id:32), the value in $df00 is generally not 0. So it jumps into the wrong bank and the program crashes.
In my opinion, the memory area $DF00-$DFFF of the Easyflash-RAM in VICE should be initialized with nonzero values (for example $55, $aa) or random pattern.