Changing softdevice from S140 to S340

Hello,

In continuation to the ticket: https://devzone.nordicsemi.com/f/nordic-q-a/70795/replacing-s140-with-s340-softdevice

I'm trying to switch between S140 and S340 bases apps.

When I try to reverse change the SD and App. from S340 to S140.

I created the BL+SD+APP for the S140, the same way as for S340 as explained in above link.

I am able to reverse the firmware from S340 to S140.

So here is what I have achieved till now:

1. I erase all firmware from a device + upload SD(S140)+BL. Then upload the firmware (APP) with same S140 settings.

2. I am able change from the firmware with S140 (BLE only) to the firmware with S340 (BLE+ANT) -successful

3. Change from the firmware with S340 (BLE+ANT) to the firmware with S140 (BLE only) - successful 

4. Again, change from the firmware with S140 (BLE only) to the firmware with S340 (BLE+ANT) - FAILED

Step#4 is where the problems arrives, here it gives following error:

I repeated this many times but it stops at this step.

The behavior is consistent and I cannot understand why it's successful first time but not the second time.

It always gives error on step#4, never has any issue on step #2

My goal is that the end user should be able to switch b/w S140 and S340 based files any time.

Thanks

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