# \[Legacy Topics] Bridging RNDR ERC-20 Polygon Tokens to Upgrade

## NOTE: the Ethereum<>Polygon bridge is now deprecated. The below information is retained for record-keeping purposes only.

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To bridge your RNDR (POL) to RENDER (SOL), get step-by-step instructions: <https://know.rendernetwork.com/general-render-network/rndr-to-render-what-you-need-to-know/using-the-solana-upgrade-assistance-tool>&#x20;

and then go to [polygon.rendernetwork.com](https://polygon.rendernetwork.com) to begin your upgrade.&#x20;

The below information is for legacy record-keeping purposes only.

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\&#xNAN;*\*please verify all token contract addresses from official Render Channels only - accessible* [***here***](https://medium.com/render-token/render-network-contract-address-resources-and-official-channels-a80d822bff52)*.\**

RNDR ERC-20 Tokens on the Polygon Mainnet need to be bridged to RNDR ERC-20 Tokens on the Ethereum Mainnet in order to be upgraded to Solana SPL Tokens through the [Upgrade Portal](https://upgrade.rendernetwork.com/).&#x20;

If you need to bridge RNDR Tokens on the Polygon Mainnet, first locate your RNDR ERC-20 Tokens by switching to the Polygon Mainnet in Metamask (or other supported wallets that support Matic and the Polygon Bridge). For the purposes of this guide, Metamask is used as an example.

**Note: You will only be able to upgrade from Polygon to Solana once via our Upgrade Portal.**&#x20;

Click the Dropdown by the **Ethereum Mainnet** Symbol.

<figure><img src="https://1286142079-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MKt2GmpnqwLIsi-Sh1Z%2Fuploads%2Foyd9AHWXxesTCDCtzK5T%2FScreen%20Shot%202024-07-16%20at%2012.15.39%20PM.png?alt=media&#x26;token=62f1ba2e-8c7d-4434-84b1-e9262aac4057" alt="" width="349"><figcaption></figcaption></figure>

And then select the **Polygon Mainnet**

<figure><img src="https://1286142079-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MKt2GmpnqwLIsi-Sh1Z%2Fuploads%2F1szCEsYf3hqRYBOUEUfR%2FScreen%20Shot%202024-07-16%20at%2012.16.00%20PM.png?alt=media&#x26;token=bc302565-b679-4a8e-9d3f-5c4919057420" alt="" width="313"><figcaption></figcaption></figure>

If the RNDR Tokens do not automatically appear in your wallet, you may need to import the tokens.&#x20;

<figure><img src="https://1286142079-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MKt2GmpnqwLIsi-Sh1Z%2Fuploads%2FeSbbpqsPxrCzHqBkSHUY%2FScreen%20Shot%202024-07-16%20at%2012.19.57%20PM.png?alt=media&#x26;token=8dcebc91-64cc-43b9-a747-38c88c7d57f8" alt="" width="350"><figcaption></figcaption></figure>

Click **Import tokens** and enter the RNDR ERC-20 Polygon Contract address in the 'Token Contract address' field:  [**0x61299774020dA444Af134c82fa83E3810b309991**](https://polygonscan.com/token/0x61299774020dA444Af134c82fa83E3810b309991) The RNDR symbol should auto-populate, and click '**Next**.' Your RNDR ERC-20 Polygon token balance should appear and click '**Import**'.

**Reminder: You will only be able to upgrade once from Polygon to Solana via our Upgrade Portal.**

<div><figure><img src="https://1286142079-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MKt2GmpnqwLIsi-Sh1Z%2Fuploads%2FD6ipUf4KgrmouC9ZdITh%2FScreen%20Shot%202024-07-16%20at%2012.27.31%20PM.png?alt=media&#x26;token=8c60ffcc-66e2-4d0f-9f21-fc65fce45386" alt=""><figcaption></figcaption></figure> <figure><img src="https://1286142079-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MKt2GmpnqwLIsi-Sh1Z%2Fuploads%2FwCfoq881yPWsiYWT5NvD%2FScreen%20Shot%202024-07-16%20at%2012.26.41%20PM.png?alt=media&#x26;token=d3ff0ecc-1ed5-4693-acdd-bbec9526150c" alt=""><figcaption></figcaption></figure></div>

Now that your tokens are successfully imported, you can bridge using Polygon's native bridge: <https://portal.polygon.technology/bridge>&#x20;

\[**please note**: bridging using Polygon's bridge will take approximately 45 minutes to an hour]

Click **Connect Wallet** using your wallet of choice.&#x20;

<figure><img src="https://1286142079-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MKt2GmpnqwLIsi-Sh1Z%2Fuploads%2FX1TNQqsco0Q7UyNsd2dc%2FScreen%20Shot%202024-07-16%20at%2010.11.40%20PM.png?alt=media&#x26;token=d18fcc1a-9ca0-4d9b-a857-3b5b08c316f0" alt=""><figcaption></figcaption></figure>

Select **'Polygon POS'** in the **Transfer from** dropdown menu, select the **RNDR Token** in the token drop down menu on the Right, and select '**Ethereum**' in the **Transfer to** dropdown menu, and click **Bridge**. \[**Note**: You will need a small amount of Polygon tokens in your account to pay the transaction fees in order to bridge]

<figure><img src="https://1286142079-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MKt2GmpnqwLIsi-Sh1Z%2Fuploads%2FKzXcmih4VpyTsUtnlev8%2FScreen%20Shot%202024-07-16%20at%2010.18.00%20PM.png?alt=media&#x26;token=08562abc-14e8-4c16-8545-7f51e046c2c3" alt=""><figcaption></figcaption></figure>

Confirm the transaction in your wallet and wait for the Bridge to complete (roughly 45 minutes).&#x20;

<div><figure><img src="https://1286142079-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MKt2GmpnqwLIsi-Sh1Z%2Fuploads%2F3YtW1y7mVGTJGPRDSEiM%2FScreen%20Shot%202024-07-16%20at%2010.22.25%20PM.png?alt=media&#x26;token=4fa68ff9-9589-4100-bebf-a46d952b3940" alt="" width="528"><figcaption></figcaption></figure> <figure><img src="https://1286142079-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MKt2GmpnqwLIsi-Sh1Z%2Fuploads%2FEkJKPAlH6qzbVV1LYXnD%2FScreen%20Shot%202024-07-16%20at%2010.22.24%20PM.png?alt=media&#x26;token=f4cc1543-abd4-421d-82f7-b9b1063359f7" alt="" width="563"><figcaption></figcaption></figure> <figure><img src="https://1286142079-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MKt2GmpnqwLIsi-Sh1Z%2Fuploads%2Fa9z4EhkqnujkgnqdBPHD%2FScreen%20Shot%202024-07-16%20at%2010.22.23PM.png?alt=media&#x26;token=be5a34bd-da8f-46ac-88d1-80001a87eb27" alt="" width="563"><figcaption></figcaption></figure></div>

Once this completes you will need to **Claim** your tokens on the Ethereum Mainnet. To do so, click **Add RNDR to wallet** in order to import the RNDR ERC-20 contract on the Ethereum Mainnet. You will be prompted to switch back to the Ethereum Mainnet, click '**Switch network**' and then '**Add token**' on the Ethereum Mainnet.&#x20;

<div><figure><img src="https://1286142079-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MKt2GmpnqwLIsi-Sh1Z%2Fuploads%2F7UsepUdqCqmJro5dPDQz%2FScreen%20Shot%202024-07-16%20at%2010.49.52%20PM.png?alt=media&#x26;token=d2655b1b-be10-4fee-a4e4-d9ba6563671c" alt=""><figcaption></figcaption></figure> <figure><img src="https://1286142079-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MKt2GmpnqwLIsi-Sh1Z%2Fuploads%2FC1cGDNuLoeq2S6rvBehK%2FScreen%20Shot%202024-07-16%20at%2010.49.48%20PM.png?alt=media&#x26;token=8313ba77-7725-4a84-9eb7-25eee8cf0691" alt=""><figcaption></figcaption></figure> <figure><img src="https://1286142079-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MKt2GmpnqwLIsi-Sh1Z%2Fuploads%2Fno9eNMcLCCsZiqSil6ep%2FScreen%20Shot%202024-07-16%20at%2010.49.47%20PM.png?alt=media&#x26;token=10fe4188-f164-461b-a071-218a8632fda1" alt=""><figcaption></figcaption></figure></div>

Once the Bridge completes, a popup will ask you to claim the RNDR ERC-20 tokens on the Ethereum Mainnet. Click **Claim,** set the Ethereum gas fee, and click **Confirm**.

<div><figure><img src="https://1286142079-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MKt2GmpnqwLIsi-Sh1Z%2Fuploads%2FwKeZte6dhhMzHJl0q879%2FScreen%20Shot%202024-07-16%20at%2011.10.54%20PM.png?alt=media&#x26;token=5e31be0c-e495-4640-b8de-93358fceb3ea" alt=""><figcaption></figcaption></figure> <figure><img src="https://1286142079-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MKt2GmpnqwLIsi-Sh1Z%2Fuploads%2FnfxlOf8rfwUHOOSlLoNV%2FScreen%20Shot%202024-07-16%20at%2011.10.53%20PM.png?alt=media&#x26;token=8bf1b687-7836-490c-ad16-24dd6a0274db" alt="" width="346"><figcaption></figcaption></figure></div>

Once the transaction completes, your RNDR tokens are bridged to the Ethereum Mainnet and you are able to upgrade them to RENDER SPL tokens on Solana using the [**Upgrade Portal**](https://upgrade.rendernetwork.com/). Please see [**here**](https://know.rendernetwork.com/general-render-network/rndr-to-render-what-you-need-to-know/using-the-solana-upgrade-assistance-tool) for guide on using the RENDER SPL token upgrade assistant tool.&#x20;

{% embed url="<https://know.rendernetwork.com/general-render-network/rndr-to-render-what-you-need-to-know/using-the-solana-upgrade-assistance-tool>" %}
Guide to using the Solana Upgrade Assistant Tool
{% endembed %}

**Migrating Genesis RNDR ERC-20 Tokens**\
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Other tokens that need additional steps before being able to be successfully upgraded to RENDER SPL Tokens on the [Upgrade Portal](https://renderfoundation.com/upgrade) are RNDR ERC 20 Tokens on the legacy genesis contract.  Please see the [RNDR Genesis Token Upgrade guide](https://know.rendernetwork.com/basics/migrating-tokens) for instructions on upgrading RNDR tokens to the current ERC 20 contract before using the Portal.&#x20;

{% embed url="<https://know.rendernetwork.com/basics/migrating-tokens>" %}
A guide to Migrating Genesis RNDR ERC-20 Tokens on Ethereum, which is needed to do for Genesis RNDR token holders prior to upgrading o Solana SPL RENDER tokens at the RENDER [Upgrade Portal](https://renderfoundation.com/upgrade).
{% endembed %}