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Single vs Dual Bank Bootloader

Can someone explain the reasons/benefits of using the single vs dual bank BLE boot loader?

Actually, why isn't there a single bank BLE bootloader in the example project in SDK 4.4.2? Is there one added in a later SDK?

I ask this because we want to use the 128K nRF51822 for cost reasons, but in dual bank mode that only gives you approximately 17k of application space. Our app won't fit in that space.

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