> For the complete documentation index, see [llms.txt](https://typeit.gitbook.io/web3keyboard/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://typeit.gitbook.io/web3keyboard/keyboard-nfts/keyboard-nfts-and-components/keyboard-nft-upgrade.md). # Keyboard NFT Upgrade Keyboard NFTs are subject for upgrades based on different costs and probabilities. Upgrade your keyboard NFTs to unlock higher levels and enhance their capabilities. Increase the rarity, computing power, and efficiency of your NFTs through successful upgrades. The probability of a successful upgrade varies based on the rarity level of the NFTs, ensuring an exciting and dynamic experience. ## Upgrade Cost During the Initial Mining stage, the upgrade cost gradually increases with each level and will be further adjusted based on the overall network computing power and mining conditions. The cost is fixed and calculated in USDT, settled through TCOIN. For instance, upgrading two level 1 NFTs to level 2 would require a cost equivalent to 5U worth of TCOIN. | NFT Level | Upgrade Cost | | --------- | ------------ | | 1 | 5 | | 2 | 25 | | 3 | 60 | | 4 | 80 | | 5 | | ## Probabilities The probability of a successful upgrade depends on the rarity level. When both NFTs have the same rarity level, the upgrade probability is 100%.

Upgrade Type	N	R	SR	SSR
N + R	70%	30%	N/A	N/A
N + SR	70%	20%	10%	N/A
N + SSR	70%	20%	7%	3%
R + SR	N/A	70%	30%	N/A
R + SSR	N/A	70%	20%	10%
SR + SSR	N/A	N/A	70%	30%