SG300-28 How update boot from file rfb - version 1.3.5.06

I download to my switch SG300-28 new firmware version 1.3.5.58 I package zip i found two file:
sx300_fw-13558.ros   - this is the firmware
sx300_boot-13506.rfb  this is the boot code
I upgrade firmware by WEBGUI swicth. ADMINISTRATION>FILE MANAGEMENT>UPGRADE/BACKUP FIRMWARE/LANGUAGE
But i dont know how i can upgrade BOOT from WEBGUI or other... Please help me a tell my how-step by step.

Hello.-
After reading release notes and some experiences in this forum, I am really worried about upgrading a SG300 firmware 1.1.2.0 to version 1.3.5.58. Release Notes points out that you have to update the boot loader before the firmware. However some users report that they had to reconfigure the switche after the upgrade.
My concern are.
- Is it necesary to boot the switche after upgrading the boot loader ?. This is not going to be a problem with the old firmware?.
- Can I apply the confirguration backup after the firmware upgrade or is necesary to reset to factory default and do it from scratch ?.
Thanks.

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