Update README.md

fw_updater_packer_unpacker/README.md

@@ -1,6 +1,26 @@
-# Official Version
+# 0x0 Allow your DPT to accept PKG without correct key
 
-Only support unpacking since we don't have the encryption key to repack it.
+This will create SECURITY FLAW in your system!
+
+Comment out the key verification: (edit via `busybox vi`)
+```
+########################################
+# verify sig
+########################################
+# dd if=$1 bs=$(($DATA_OFFSET)) skip=1 2>/dev/null | head -c $(($BODY_SIZE)) |
+# openssl dgst -sha256 -verify $3 -signature $SIG_FILE 1>/dev/null
+# if [ $? -ne 0 ]
+# then
+#   echo "Verify failed."
+#   exit 0
+# fi
+```
+
+# 0x1 Create your own PKG package
+
+## Use Official PKGs as Examples
+
+An easy approach is to use the official pkg to begin with. Once you have downloaded the official pkg, use `official_pkg_unpacker_pkg.sh` to unpack it.
 
 Usage:
 ```
@@ -8,20 +28,49 @@ chmod +x official_pkg_unpacker_pkg.sh
 ./official_pkg_unpacker_pkg.sh <file/path/to/official/pkg> <output/folder/path>
 ```
 
-# Unofficial Version
+Then you can change the bash and let it run "anything" (as long as supported in diagnosis mode) during the update.
 
-With modified diagnosis mode, it shall support unofficial pkg.
+## Tips
 
-Unpacker is the same as official one, except we disabled verification.
+* In the bash, `exit 0` means it will reboot, while `exit 1` or any error status will shut down the system.
+* Double check your commands. Try them first in diagnosis mode.
 
-The repacker follows a reversed procedure, but we simply use the data encryption key.
+# 0x2 Re-Pack it with your own key
 
-Usage:
+(as written in the bash, I use the data decryption key instead)
+
+Pack the PKG with:
 ```
-chmod +x unofficial_pkg_unpacker_pkg.sh
 chmod +x unofficial_pkg_repacker_pkg.sh
 
-
-./unofficial_pkg_unpacker_pkg.sh <file/path/to/official/pkg> <output/folder/path>
 ./unofficial_pkg_repacker_pkg.sh <previous/output/folder/path>
 ```
+
+# 0x3 Validate the package
+
+
+Easy validation by unpacking it again:
+```
+chmod +x unofficial_pkg_unpacker_pkg.sh
+
+./unofficial_pkg_unpacker_pkg.sh <file/path/to/official/pkg> <new/output/folder/path>
+```
+
+If succeeded, the package PKG will be recognized by the DPT system.
+
+
+# 0x4 Flash it
+
+You can use `dpt-tools.py` to update the firmware you made:
+
+```
+python dpt-tools.py -id <deviceid file path> -k <your key file path> -ip <ip address>
+```
+Then type `fw` and follow the instruction.
+
+
+# Known Issues
+
+* After reboot, it will appear errors saying update failed. But PKG is actually applied.
+
+* Not supporting animations yet.