Date created: 22 Sep 2024
Date updated: 22 Sep 2025
Several of the COROS firmware releases during 2024 are problematic for the speedsurfing community. This page captures the various issues, listing the COROS firmware releases since the start of 2024 in reverse-chronological order.
The task of testing new firmware releases has become extremely onerous, so I have not done any testing in 2025 since the 3.0808.0 release. Hopefully the firmware releases following 3.0808.0 are ok, but I do not know for sure.
General advice for watches with broken firmware:
Downgrading your firmware:
Prior to reviewing the finer details on this page it is advisable to read the article about sampling rates and aliasing. It would also be beneficial to read the article comparing the windsurfing and speedsurfing activities on COROS watches.
This table is a summary of the COROS firmware releases since the beginning of 2024.
| APEX Pro | VERTIX | APEX 2 | APEX 2 Pro | VERTIX 2 | VERTIX 2S | |
|---|---|---|---|---|---|---|
| 3.1012.0 | - | - | ? | ? | ? | ? |
| 3.1011.0 | - | - | ? | ? | ? | ? |
| 3.1008.0 | - | - | ? | ? | ? | ? |
| 3.0910.0 | - | - | ? | ? | ? | ? |
| 3.0808.0 | ? | 😡👎 | ? | 😊🤙 | 😊🤙 | ? |
| 3.0807.0 beta | - | - | ? | 😊🤙 | 😊🤙 | ? |
| 3.0709.0 | - | - | 😊🤙 | 😊🤙 | 😡👎 | 😡👎 |
| 3.0708.1113 beta | - | - | - | - | 😊🤙 | 😊🤙 |
| 3.0708.0 | - | - | 😊🤙 | 😊🤙 | 😡👎 | 😡👎 |
| 3.0706.0 beta | - | - | 😊🤙 | 😊🤙 | 😡👎 | 😡👎 |
| 3.0510.0 | 😡👎 | 😡👎 | 😐🤞 | 😐🤞 | 😐🤞 | 😐🤞 |
| 3.0509.0 | 😊🤙 | 😊🤙 | - | - | - | - |
| 3.0508.0219 beta | 😊🤙 | 😊🤙 | - | - | - | - |
| 3.0508.0 | 😡👎 | 😡👎 | 😐🤞 | 😐🤞 | 😐🤞 | 😐🤞 |
| 3.0506.0 beta | - | - | 😐🤞 | 😐🤞 | 😐🤞 | 😐🤞 |
| 3.0409.0 | 😊🤙 | 😊🤙 | 😡👎 | 😡👎 | 😡👎 | 😡👎 |
| 3.0408.0 | 😊🤙 | 😊🤙 | 😡👎 | 😡👎 | 😡👎 | 😡👎 |
| 3.0309.0 | 😊🤙 | 😊🤙 | - | - | - | - |
| 3.0308.0 | - | - | 😊🤙 | 😊🤙 | 😊🤙 | - |
There have been four distinct behaviors for speedsurfing activities during 2024:
The official COROS release notes are often out of date and do not mention any of the changes in behavior:
The 3.08xx.0 released have fixed the issues affecting the VERTIX 2 and VERTIX 2S with 3.07xx.0.
| APEX Pro | VERTIX | APEX 2 | APEX 2 Pro | VERTIX 2 / 2S | |
|---|---|---|---|---|---|
| 3.0808.0 | - | - | 2025-01-15 | 2025-01-15 | 2025-01-15 |
| 3.0807.0 beta | 2025-01-01 | 2025-01-01 | 2025-01-01 |
The beta release 3.0706.0 appears to fix the issues between May and Aug 2024, but only on the APEX 2 and APEX 2 Pro.
The VERTIX 2 + 2S are broken and have reverted back to the behavior of 3.040x.0 in May 2024.
| APEX Pro | VERTIX | APEX 2 | APEX 2 Pro | VERTIX 2 / 2S | |
|---|---|---|---|---|---|
| 3.0709.0 | 2024-12-03 | 2024-12-03 | 2024-12-03 | ||
| 3.0708.1113 beta | - | - | 2024-11-13 | 2024-11-13 | 2024-11-13 |
| 3.0708.0 | - | - | 2024-10-15 | 2024-10-15 | 2024-10-15 |
| 3.0706.0 beta | - | - | 2024-09-13 | 2024-09-13 | 2024-09-13 |
The 3.05xx.0 releases exhibit issues because speedsurfing behaves much like windsurfing, which is non-doppler and thus prone to spikes.
Owners of an APEX Pro or VERTIX with firmware 3.050x.0 (released Aug 2024) are advised to downgrade to the 3.0309.0 firmware.
| APEX Pro | VERTIX | APEX 2 | APEX 2 Pro | VERTIX 2 / 2S | |
|---|---|---|---|---|---|
| 3.0510.0 | - | - | 2024-08-02 | 2024-08-02 | 2024-08-02 |
| 3.0508.0 | 2024-08-07 | 2024-08-07 | 2024-07-15 | 2024-07-15 | 2024-07-15 |
| 3.0506.0 beta | - | - | 2024-07-01 | 2024-07-01 | 2024-07-01 |
The 3.04xx.0 releases exhibit major smoothing issues on Airoha watches (APEX 2, APEX 2 Pro, VERTIX 2), reminiscent of Garmin watches in 2022.
The smoothing issues do not affect the Sony watches (APEX Pro, VERTIX).
| APEX Pro | VERTIX | APEX 2 | APEX 2 Pro | VERTIX 2 / 2S | |
|---|---|---|---|---|---|
| 3.0409.0 | 2024-06-06 | 2024-06-06 | 2024-05-21 | 2024-05-21 | 2024-05-21 |
| 3.0408.0 | 2024-05-xx | 2024-05-xx | 2024-05-10 | 2024-05-10 | 2024-05-10 |
The 3.03xx.0 releases exhibit the original behavior, similar in many respects to the Garmin watches in 2024.
However, unique to the COROS is the temporal offset issue on the APEX 2, APEX 2 Pro, VERTIX 2 which causes fantasy alphas.
Owners of an APEX Pro or VERTIX with firmware 3.050x.0 (released Aug 2024) are advised to downgrade to the 3.0309.0 firmware.
| APEX Pro | VERTIX | APEX 2 | APEX 2 Pro | VERTIX 2 | |
|---|---|---|---|---|---|
| 3.0309.0 | 2024-01-31 | 2024-01-31 | - | - | - |
| 3.0308.0 | - | - | 2024-01-31 | 2024-01-31 | 2024-01-31 |