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Explain what? How RBF works?
Is simply replace a tx with another one with a higher fee.

402 payment required channel have an excellent video tutorial for that.

view on www.youtube.com

and here is a video about CPFP (child pay for parent) - when you keep the same tx but pay a higher fee from a child address.

https://video.nostr.build/af33075758e38640a10814e06e14f6521f38a581e2f4aa852b8554c5e8591b1c.mp4

Ok so RBF actually replaces the initial transaction, whereas CPFP is a rebroadcast?
I'm still a little confused when when they say this person

forgot to update their change output

From the tutorial, it looks like electrum wallet doesn't even require this step.

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Electrum and Sparrow are doing RBF and CPFP in very simple steps. Just right click on a unconfirmed tx and you can choose one or another method.

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Lol, so this midwit did something weird. I'm still trying to wrap my head around how they messed up so badly.

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yeah many noobs doing this, due to bad UI of the wallets they use.
Many noobs are using really trash wallets.
Could be also a bad script of an app too.

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CPFP is not a rebroadcast. When doing CPFP, the recipient spends the output before it is confirmed, but with a high fee. If the miner wants to collect the high fee, he has to mine both transactions because the one with the second one (the child) depends on the first (the parent).

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Thanks for the point of clarification.

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