The following database is gathering the stock firmware for BQ devices. Check out if the flash for BQ BQ-5591 Jeans is available. All files contain BQ official stock firmware. You can download Android software for BQ BQ-5591 Jeans completely free. Use the following flash to update, downgrade or simply flash your device.
|5515L||BQ 5515L MT6739 20180409 8.1.0||8.1|
|Aquaris V||BQ Aquaris V MSM 1.16.0 20190109||-|
In order to flash your BQ BQ-5591 Jeans you need to check out either your device is using MTK (the firmware name should contain "MT") or Qualcomm chipset(the firmware name should contain "MSM"). In the case of MTK, you need to use the SP Flash tool to flash the software.