Cash Deposit
Since we don't have branches or ATMs, you would need to use an external source to deposit cash to your bunq account. Luckily there are some companies that can help you do this (such as Barzahlen for bunqers residing in Germany, Austria and Italy 👍). See how you can use Barzahlen here.
If you are also the customer of another bank, you can also deposit cash with them and then use the Top Up feature to transfer the funds to your bunq account.