sorry for my very bad english
I'have a dahua nvr 5232 bricked
i can connect to uart and this is the u-boot version
B2020> version
U-Boot 2013.01-svn1371 (Jan 30 2015 - 13:27:11)svn:1371
armv7-linux-gcc (GCC) 4.6.3 20120301 (STMicroelectronics/Linux Base 4.6.3-113)
GNU ld (GNU Binutils -...