This post outlines the process of migrating from Iceshrimp, a fork of Firefish (itself a fork of Misskey v12), to Misskey, starting from v13. The author details their reasons for migrating, including ongoing reimplementation efforts in .NET, issues with media rendering, and a general preference for Misskey. A comparison table highlights key differences between Iceshrimp and Misskey, such as translation API, note editing capabilities, MOTD, note length limits, search engine options, FTT, and social login. The guide provides a step-by-step walkthrough, including backing up and rolling back the database, running specific SQL commands to align the database schema with Misskey, and installing Misskey without initializing it to prevent data corruption. Troubleshooting tips are included for common issues like login failures and client loading problems. This migration guide offers valuable insights for those looking to transition from Iceshrimp to Misskey, ensuring a smoother process.