Changes

ldr w0,[r1,0] // like above but reads 32 bits only - note the use of w0 instead of r0 for the source register name

ldrb w0,[r1,0] // like above but reads 1 byte (8 bits) only - note the use of w0 instead of r0 for the source register name

ldur r0,[r1,0] // load register r0 from the address pointed to by (r1 + 0) - the mnemonic means "load ''unscaled'' register"

mov r0,r1 // move data from r1 to r0