Having trouble updating firmware

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d3nd3-o0
The Settings-> About Page shows correct firmware version number. But when i reboot with BTN1 and BTN2 held down.. on the dfu startup it reads

WATCHDOG
DFU 2v05

I looked at the src code of the Espruino in file src/jsutils.h

#ifndef BUILDNUMBER
#define JS_VERSION "2v06"
#else
#define JS_VERSION "2v06." BUILDNUMBER
#endif

and targets/nrf5x_dfu/main.c
```
    lcd_println("DFU " JS_VERSION "\n");
```
I mean why the output on my screen showing previous version firmware JS_VERSION. Is it because the old firmware is still in ram somewhere?? partly?? How to fully reboot with new firmware?

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