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[Home ](./index.md ) > [bitburner ](./bitburner.md ) > [Hacknet ](./bitburner.hacknet.md ) > [upgradeCore ](./bitburner.hacknet.upgradecore.md )
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## Hacknet.upgradeCore() method
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Upgrade the core of a hacknet node.
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< b > Signature:< / b >
```typescript
upgradeCore(index: number, n: number): boolean;
```
## Parameters
| Parameter | Type | Description |
| --- | --- | --- |
| index | number | Index/Identifier of Hacknet Node. |
| n | number | Number of cores to purchase. Must be positive. Rounded to nearest integer. |
< b > Returns:< / b >
boolean
True if the Hacknet Node’ s cores are successfully purchased, false otherwise.
## Remarks
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RAM cost: 0 GB
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Tries to purchase n cores for the specified Hacknet Node.
Returns true if it successfully purchases n cores for the Hacknet Node or if it purchases some positive amount and the Node reaches its max number of cores.
Returns false otherwise.