Unable to establish BLE connection after porting SDK version from 11.0.0 to 12.1.0

Question

I carried out following steps: 
 
 Application was using SDK 11.0.0 for nRF51 SoC 
 Ported SDK version 12.1.0 
 Using secure DFU boot-loader from SDK 12.1.0 (followed all steps mentioned under blog https://devzone.nordicsemi.com/nordic/short-range-guides/b/software-development-kit/posts/getting-started-with-nordics-secure-dfu-bootloader ) 
 Erased flash and updated with secure boot-loader + soft device s130_nrf51_2.0.1 
 Generated signed DFU .zip package with --sd-req set to 0x87 and with the private key 
 Able to flash signed DFU package successfully through nrfConnect App 
 Device BLE scan/broadcast data has correct name of device as defined. 
 Power reset the device to confirm that the application is running as expected. 
 On sending BLE command/attempting to DFU, unable to establish BLE connection. 
 Below error is reported on nrfConnect while attempting to perform DFU operation.

Need support in addressing this issue. 
 Thanks, 
 Rahul

Hung Bui · Accepted Answer

Hi Rahuld, I had a look at the buttonless example in SDK v12.1 and there was a bug in ble_dfu.c that we don't enable write property. And only has notify property, I assume you have fixed this ? Otherwise it's not possible to switch to bootloader. 
 After adding this line 
 char_md.char_props.write = 1; 
 in line 91 right under char_md.char_props.notify = 1; 
 the buttonless application worked for me. (this is fixed in SDK v12.3) If it still doesn't work for you please send us your hex file (bootloader + application) so we can test here. Please try testing using another phone or using nRF Connect on OP as well. If possible please move to SDK v12.3 to have more bug fixes.

Unable to establish BLE connection after porting SDK version from 11.0.0 to 12.1.0

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