You bank controls what is available for downloading & not QuickBooks.

Ask your bank how you can download prior transactions.

Resolution for 'bank controls issue: 'My bank only imported 3 months of transactions, how can I import all transaction from 2017?' available: Yes.

The bank controls issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the bank controls issue yourself by looking for a resolution described in the article. If it is a complex bank controls issue or you are unable to solve the issue, you may contact us by clicking here or by using other bank controls support options.

For more information about resolving issues related to bank controls in Quickbooks/QBO or to get support for the issue 'My bank only imported 3 months of transactions, how can I import all transaction from 2017?', click the link below: