diff --git a/proto9x/flash.py b/proto9x/flash.py
index 7c79a2c..d0d1483 100644
--- a/proto9x/flash.py
+++ b/proto9x/flash.py
@@ -88,6 +88,9 @@ def get_fw_info(partition):
 
     return FirmwareInfo(major, minor, buildtime, modules)
 
+def write_enable():
+    assert_status(tls.cmd(db_write_enable))
+
 def flush_changes():
     assert_status(tls.cmd(b'\x1a'))
 
diff --git a/proto9x/sensor.py b/proto9x/sensor.py
index 4754ddb..a7b91b8 100644
--- a/proto9x/sensor.py
+++ b/proto9x/sensor.py
@@ -2,6 +2,7 @@
 from .tls import tls
 from .usb import usb
 from .db import db, subtype_to_string
+from .flash import write_enable, flush_changes
 from time import sleep
 from struct import pack, unpack
 from binascii import hexlify, unhexlify
@@ -9,7 +10,6 @@ from .util import assert_status, unhex
 from .hw_tables import dev_info_lookup
 from .blobs import identify_prg, enroll_prg, reset_blob
 
-
 def glow_start_scan():
     cmd=unhexlify('3920bf0200ffff0000019900200000000099990000000000000000000000000020000000000000000000000000ffff000000990020000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000')
     assert_status(tls.app(cmd))
@@ -96,13 +96,19 @@ def append_new_image(key=0, prev=b''):
 
     usb.wait_int()
 
+
+    write_enable()
     rsp=tls.app(b'\x6b' + prev)
     assert_status(rsp)
+    flush_changes()
     
     usb.wait_int()
 
+    write_enable()
     rsp=tls.app(b'\x6b' + prev)
     assert_status(rsp)
+    flush_changes()
+    
     res=rsp[2:]
 
     rsp=tls.app(unhexlify('6900000000'))