How to update EC25 firmware?

Is there any tool to update the fw of a EC25, installed in an openwrt device ?

You will need to install qmi-utils which contains the qmi-firmware-update tool. Also make sure that uqmi or modemmanager don't interfere with the modem while updating (ie. remove or disable the wwan interface).

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I assume, this would need QMI for the modem. Actually I am using plain, old PPP, which i.g. works very stable. So, is there any other option ?

You will need to (temporarily) switch the modem to QMI mode for firmware update. MBIM mode can also work as there is QMI-over-MBIM.