A simple datapack mod make can updata equipment.
It add some recipes can help you updata your equipment in smithing table.
you can updata stone and leather equipment to iron equipment( also iron and golden equipment to diamond).
In 1.20 due to updata equipment need template,so this mod also add a recipes to help you recipes upgrade smithing template.
8 planks + 1 cobblestone

For the detailed information, please read the minute contents below. THANKS!!!
How to Install Better Equipment Smithing (Datapack)
Better Equipment Smithing by skniro is verified for Datapack, Fabric, Forge, Neoforge, Quilt across Minecraft versions 1.16, 1.16.1, 1.16.2, 1.16.3, 1.16.4, 1.16.5, 1.17, 1.17.1 (latest release: 1.1.1-26.3-Forge, file size: 34 KB). Follow the steps below to install it safely from ModCraft.tv:
- Click the Download button above and select your Minecraft version (1.16, 1.16.1, 1.16.2, 1.16.3, 1.16.4, 1.16.5, 1.17, 1.17.1) and platform (Datapack, Fabric, Forge, Neoforge, Quilt).
- Make sure you have the compatible loader or environment installed for Datapack, Fabric, Forge, Neoforge, Quilt.
- Move the downloaded Better Equipment Smithing file into your Minecraft
.minecraft/saves/<world>/datapacksfolder and launch the game.
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