mysterious flash download timeout STM32f10x

We have a bootloader residing in 0800 0000 to 0801 ffff and an app residing in 0802 0000 to 0807 ffff

how can it be that with some versions of the bootloader I get flash erase and/or flash downkoad timeouts when JTAG loading the app which resides in a toally different part of memory?

Erik

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