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You can use Visual Mode to assemble code using `A`.
For example let's replace the `push` by a `jmp`:
Before[1]
Notice the preview of the disassembly and arrows:
After[1]
You need to open the file in writing mode (`r2 -w` or `oo+`) in order to patch the file.
You can also use the cache mode: `e io.cache = true` and `wc?`.
Remember that patching files in debug mode only patch the memory not the file.
