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+# Notes on Hello Perso sample app.
+
+Hello Perso is a sample app from the LedgerHQ repository
+[blue-sample-apps](https://github.com/LedgerHQ/blue-sample-apps). It's
+stated purpose is to be a "a simple application showing the UI and master
+seed derivation."
+
+# Compiling:
+
+Compiles fine inside Docker image, as in the process described in the
+[Getting Started](http://ledger.readthedocs.io/en/latest/nanos/setup.html)
+tutorial (which takes you through the Hello World tutorial).
+
+In extracting the hex-encoded compiled app from the docker container to my
+local machine, I changed the app name as follows:
+
+``` bash
+sudo docker cp [container_id]:/home/blue-sample-apps/blue-app-helloperso/bin/app.hex perso-app.hex
+```
+
+I then loaded the app onto the Nano S using the following, and then
+discovered a problem:
+
+``` bash
+python -m ledgerblue.loadApp --targetId 0x31100002 --apdu --fileName perso-app.hex --appName HelloPerso --appFlags 0x00 --icon ""
+```
+
+The problem: Hello Perso app requires the `APPLICATION_FLAG_GLOBAL_PIN`
+permission flag. I had just copied and pasted my loadApp command line for
+HelloWorld and changed the app name and image name.  But the `--appFlags`
+argument needed to be changed to `--appFlags 0x40`.
+
+Symptoms: With the wrong permissions set, even though the app was
+successfuly loaded onto the device, it would freeze the Nano every
+time I started the app, requiring a power-cycle to get back to the
+dashboard.
+
+The correct load command was:
+
+``` bash
+python -m ledgerblue.loadApp --targetId 0x31100002 --apdu --fileName perso-app.hex --appName HelloPerso --appFlags 0x40 --icon ""
+```
+
+### How to remove apps:
+
+Problem Two: Repeating the loadApp() command with the correct flags failed
+because the app already existed on the device.  It apparently won't
+overwrite.  Thus I had to find a delete command, which fortunately is
+referenced in the Makefile.  To manually delete the app, this is the
+command:
+
+``` bash
+python -m ledgerblue.deleteApp --targetId 0x31100002 --appName HelloPerso
+```
+
+### Permission flags defined:
+
+The `0x40` permission flag that was needed is defined by macro constant
+`APPLICATION_FLAG_GLOBAL_PIN` in
+[nanos-secure-sdk/include/os.h](https://github.com/LedgerHQ/nanos-secure-sdk/blob/master/include/os.h),
+along with many other application flags.