diff --git a/mib/reflash.py b/mib/reflash.py
index <HASH>..<HASH> 100644
--- a/mib/reflash.py
+++ b/mib/reflash.py
@@ -35,10 +35,10 @@ def build_reflasher(stub, payload, chip):
 
 	oldret = Instruction('retlw 0')
 
-	if stub[start_addr] != Instruction('retlw 0').encode():
+	if stub[start_addr] != Instruction('retlw 0xAB').encode():
 		raise ValueError("Invalid reflashing stub, wrong instruction at start_addr 0x%X" % start_addr)
 
-	if stub[size_addr] != Instruction('retlw 0').encode():
+	if stub[size_addr] != Instruction('retlw 0xCD').encode():
 		raise ValueError("Invalid reflashing stub, wrong instruction at size_addr 0x%X" % size_addr)
 
 	start_instr = 'retlw 0x%X' % start_row
Add marker instructions to idenfity reflashing module

This lets mibtool more accurately infer if it's working with
a real mib<I>_reflasher and minimizes the chances of an error
occuring