Old RAK811 issue

i have old WisNode board with STM32L151CB (not STM32L151CB-A)
Flash size 128K but RAM only 16K (from 20000000 to 20004000)
So RUI_RAK811_V3.0.0.3.H.bin can’t start because stack pointer set to 20008000.
Also SysTick timer not disabled on jump from bootloader to application.
Can you publish source codes so i can change for my strange RAK811 ?

Thanks in advance

P.S. If i change 20008000 to 20004000 firmware works.

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