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The main issues I had upgrading to a newer version were:

• apps didn't work properly (e.g., Loading... displayed forever),
  
• impossibility to connect over BLE (with the App Loader or the WebIDE).
  
  

I did try:

• resetting the watch,
  
• resetting without loading any code but it didn't help (it still went straight to watch mode, if I remember well, and I couldn't connect over BLE).
  
  

What worked for me was what I describe in my previous post:

• to downgrade the firmware first (DFU upgrade over BLE did work),
  
• to successfully connect over BLE (with the App Loader or the Web IDE),
  
• to erase all the apps,
  
• to upgrade (performing BLE DFU upgrade),
  
• to connect over BLE successfully (with the App Loader or the Web IDE),
  
• to reinstall the apps.
  

Just a naive question: why not choosing an Ai-Thinker A9G-based development board rather than the RAK5010, as it is so much cheaper ($7-$8) and has basically the same specs?

Is it because the RAK5010 development board is equipped with a nRF52 thus making the port easier? (Actually this makes a lot of sense.)

There are ports of Micropython to the A9G development board (the manufacturer official one and an advanced port which is well maintained), so it might be worth investing this board as an alternative...

I think I have some clues regarding the issue with the Ctrl+` shortcut:
It has to do with the grave accent being a dead key on the french keyboard (E.g. to type ù easily).

Thus to get a grave accent character only, one has to press the ` key followed by Space. This dead key behavior shouldn't hold when pressing Ctrl before.

In Microsoft Visual Studio Code such a shortcut works properly with the french keyboard. I was able to get this shortcut working properly in the Espruino Web IDE switching my keyboard to standard QWERTY. I will investigate further by setting breakpoints in Devtools...

After being stuck also in the same situation described above, it might help some people to know that, in order to remove successfully all the apps using the online app loader, I had first to downgrade Espruino to an older version (such as 2v04)...

Only then was I able to delete the apps.

Then was I able to upgrade, to reinstall the apps on this upgraded app-free Espruino, and have them working properly...

Nice!
But the Ctrl+` shortcut doesn't seem to be working for me (Windows 10, french keyboard, Web IDE 0.73.0).
Am I the only one having such an issue with this shortcut?

Nice it works well indeed!
And it allows to download files generated by a data logger program running on the Espruino device easily!

Maybe the icon would rather be the same as the upload button but pointing downwards to represent a download action, wouldn't it?

BTW: Are you thinking of implementing the Ctrl+` shortcut we discussed on GitHub that switches focus between the REPL and the editor screen?

You should have a look at: https://github.com/espruino/BangleApps#offline
Basically the idea is to call require("Storage").write(...) to save your code in flash and make it persistent.
Following the indications of this small tutorial (choosing a name, picking an icon, etc) allows to call your app from the app menu.

The font should be 6x8 already?

Indeed it is!
And there is no way to make it larger with the current firmware as the font size is hard coded.

Is there a way to change the Terminal font size from 4x6 to 6x8?
It seems that g.setFont("6x8") doesn't work in that situation.

I'm not quite sure what you mean there.

On some HR sensors there is a possibility to adjust the green LED brightness together with the HRM camera sensitivity. But I guess this is not the case for the Bangle.js...

Me too, I am wondering if there are extra HRM settings available (intensity, sensitivity)?

The main reason I posted this thread on the forum was that I thought my issue could concern other people with native Bangle.js as well.
As a newbie, I couldn't imagine that a different version for the compiler could be responsible for such an issue.
Money wise, I do support Gordon by owning a Pico, a Puck.js and his book. I also backed is Bangle.js Kickstarter campaign and did a donation recently.
Again I thank Gordon for his willingness to help me despite being occupied to bring the Bangle.js out there and my DIY Bangle.js not benefiting him directly.

France

Thank you so much Gordon for helping me. The reason DFU mode was failing was exactly the one you anticipated.

I was using arm-none-eabi-gcc version 8-2019-q3-update to compile the firmware and indeed at the end of bootloader...hex was this line :08E00C0011C30700C1C10700A8. After switching to the same compiler version as yours I got this line :08DFF40021C30700CDC10700A5 instead.

I tested an was able to perform BLE DFU upgrade from version 2v04.264 to 2V04.271.

Thank you again for your reactivity and your willingness to help.

Finding a way to get a few more bytes out of the bootloader is definitely out of my reach. But I wish to contribute by filing bug reports and sharing small apps with the community.

On my watch BTN1 doesn't feel as stiff as BTN2 and 3 (BTN1 rounded metallic pad on the white flexible PCB for buttons in the watch might be loose a little).

Could this result in a bad debouncing for BTN1 making it like the button has been pressed/released a few times?
(However I didn't notice such a bad debouncing effect when scrolling across the watch menus.)

Opening the watch and using the Serial Wire Debug interface (SWD).

@fanoush:
What about UICR? (Maybe address 0x10001014 has to do with it?)
I think while I was disabling the flash protection (mass erase) I did also flash bank 1 with 0xFFs.

[EDIT] I checked and address 0x10001014 is indeed UICR.BOOTLOADERADDR.
So when flashing Espruino, not only bank 0 gets flashed but bank 1 as well with the 0x7a000 value.

On my watch I get this result (see video).

@MaBe:

When ==== shows, first release BTN1 and than BTN2

As soon as I release BTN1 (with BNT2 being pressed still) I can read for a short fraction of second DFU Started. But just after I get the main screen with the Bangle.js logo (keeping BTN2 pressed or releasing it).

@fanoush:
The output of peek32(0x10001014).toString(16) is ="7a000".

When compiling the firmware the log displays:

python scripts/hexmerge.py --overlap=replace
.../s132_nrf52_3.0.0_softdevice.hex
bootloader_espruino_2v04.264_banglejs.hex
espruino_2v04.264_banglejs.app_hex
dfu_settings.hex
-o espruino_2v04.264_banglejs.hex

...so I was thinking that the bootloader was merged together with softdevice, the app and dfu settings into espruino_2v04.264_banglejs.hex.

I only flashed this latest as this process worked correctly on my Puck.js as I was able to perform BLE DFU upgrade after installing the generated firmware using SWD onto it.

@MaBe:
I can read on the screen DFU Started for a fraction of second (see video of my previous message), but just after I get your screen n°5. I don't get your screen n°1 exactly as the screen with DFU Started doesn't remain still and BTN1 = REBOOT doesn't show.

@Gordon:

Had you pressed any buttons after that point?

No.

Maybe you could record a video to show what happens?

See enclosed video.

That's because you have to connect when the watch is in DFU mode

Indeed.

Is yours a Nodeconf Bangle.js?

😕 not exactly ...it is the F watch my nephew got for his birthday I hacked.
I built the firmware using command make clean && BOARD=BANGLEJS RELEASE=1 make, removed the flash protection and uploaded Espruino using SWD onto the watch.

Sorry for that Gordon: I just couldn't resist installing your software onto the watch (I do own a a Pico, a Puck.js and your book though).

@Andreas_Rozek: Isn't it 40 characters (not 60)?
Meaning 6 pixels per character including 1 pixel spacing.

I tried following the instructions at https://www.espruino.com/Bangle.js#firmware-updates to put my Bangle.js in BLE DFU mode.
For a fraction of second I can read on the watch screen DFU STARTED, but just after the main screen for the watch reappears (the screen with the default watch) and the time gets reset.
Additionally, when connecting to the watch using nRF connect on my smartphone I get this error message when asking to perform DFU: We're sorry, but this device does not support Nordic DFU.

Did someone successfully managed to perform a BLE DFU update with his Bangle.js?
Is there a special screen for the watch that mentions that the watch entered successfully DFU mode?

Thank you for your feedback.

Thank you. Can't wait to see the new Web IDE in action.

Thanks @Robin for those answers.
I need to figure out more how to implement your latest proposition.